Drop

This is Zipp's innovative all-road handlebar, the Service Course SL 70 XPLR. The bar's moniker, XPLR, exemplifies the desire to explore the world with an expanded definition of cycling on a drop bar bicycle—from paved roads onto gravel, mud, dirt, and even single track. The Service Course SL 70 XPLR helps you go faster by placing your body, starting with your hands, in an optimal "comfort zone" position for hours of rough riding over mixed terrain. Today's riders demand a few things out of their cockpit, whether they are doing a two hour training ride from home or a 200 mile gravel adventure: comfort, control, and the ability to carry what they need. We met these needs by creating a bar with shallow and wide drops, specifically focusing on two crucial metrics: outsweep and flare. Outsweep is created by rotating the drop below the brake perch outward. Flare is created by rotating the entire drop above the brake perch outward. - Distinctive Zipp cosmetics - 70mm Reach and 115mm drop allow a comfortable hoods position and a shallow drops postion - 5° drop Flare and 11° drop outsweep creates a drops position 6cm wider than hoods - Ergonomic top with 3° backsweep - Lifetime warranty

Whisky's all-carbon Spano Drop Handlebar is designed to give gravel and all-road riders the most natural hand positions anywhere on the bar. A multi-stage flare puts the hoods at an optimal angle for comfort while maximizing control through the drops. The bar's flat top promotes flex and offers relief from rough surfaces, and its 31.8 clamp diameter with 90mm width allows compatibility with bar-mounted accessories, including aero bars. - Available in five widths, measured center-to-center at the hoods: 40, 42, 44, 46, 48cm - Compound flare — 12 degrees at the hoods and 20 degrees through the drops - Drop/Reach: 100mm/68mm - 31.8mm clamp diameter Specifications: - Bar Top Style: Flat - Width Measurement: Center - Bar Clamp Diameter (mm): 31.8 - Accessory Mount Diameter: 31.8 - Bar Reach (mm): 68 - Material: Carbon - Clip-on Compatible: Yes - Bar Drop (mm): 100 - Flare: 20 - Defined Color: Black - Weight: 236 - Drop Bend Style: Compact

On today's road bikes, silver stands out amid the sea of stealthy black color schemes. This time-honored handlebar color is available on the Zipp Service Course 70 XPLR, our newest drop-bar offering. The bar's moniker, XPLR, exemplifies the desire to explore the world with an expanded definition of cycling on a drop bar bicycle — from paved roads to gravel, mud, dirt, and even singletrack. The Service Course 70 XPLR helps you go faster by placing your body, starting with your hands, in an optimal "comfort zone" position for hours of rough riding over mixed terrain. Whether on a two-hour training ride from home or a 200-mile gravel adventure, today's riders demand more of their cockpit: comfort, control, and the ability to carry what they need. We met these needs by creating a bar with shallow and wide drops while focusing on two crucial metrics — outsweep and flare. - Bar drops provide a wider, balanced, and secure position with drops that are about 6cm wider than the hoods position for technical or intense riding. - The 70 XPLR features an ergonomic top with an extended 100mm clamping area for computer mounts, aero-extensions, bags, and whatever else you may need for the long haul. - Reach: 70mm - Drop: 115mm

A few years back we started playing around with wider bars on our mountain bikes. Trendy? Yes. Beneficial? Absolutely. It wasn't simply the idea to go big, but a deeper look at the geometry of a mountain bike. Through this, we discovered that wider bars had a few killer benefits: more stability, further control, and extra comfort.  As we began designing the Coast Drop Bar, these lessons of the wide MTB bar intrigued us. Does a wider drop-bar provide extra stability and control? Why yes, yes it does. And let's chat comfort—the combination of a wider bar with a shorter stem and shallower drop provides ergonomic relief to the wrists and neck.  These are bars that you can pump while sprinting, drop into while cruising, and handle the hoods with agility and ease. Now, shape and ergonomics aren't the only important things—material is key. We opted for a 6061 alloy to control vibrations while remaining light and nimble. Like a ski with a snappy core that pops and carves at the slightest intention, these bars use the unique dimensions and ideal material to give you playful freedom. Like any good burrito…width is important. - Dual-finish sandblast/polished black anodized - 65mm Reach - Works with shallow drop and exaggerated flare to make switching body position easy - 105mm Drop - Shallow Drop for when aero isn't everything and comfort is - 20° Flare - Combo of shallow drop and 20° flare provides more wrist comfort while moving back and forth between grips and hoods

The No.9 12F Carbon is Whisky’s most versatile drop bar, that’s equally at home on tarmac, gravel, twisty cyclocross courses, and double-track. From touring to racing, this modern bar is a great addition to almost any bike. The comfortable 12-degree flare provides excellent control and comfort, especially off-road or in challenging conditions. A semi-compact design offers seamless transitions between positions, and we’ve made smart updates to improve compatibility with all your favorite drop bar controls. - Unidirectional carbon fiber construction with new carbon layup to better accommodate clamping forces of modern controls - Drop/Reach: 115/68mm

The No.9 24F carbon drop bar is designed for comfort and control in challenging situations. Specifically aimed at long-distance touring, gravel, and off-road pursuits, the 24-degree flare offers huge control from the drops. The carbon construction provides a light, stable platform that reduces vibration and adds comfort, plus a new carbon layup that better accommodates clamping forces of modern controls. This thoroughly modern drop bar is the perfect match to your off-road tourer, monster cross bike, or get-rad CX rig. The 24F’s sleek design offers a seamless transition between positions. Available in a broad size range, there’s a width to perfectly fit your needs.

The No.9 6F Carbon is Whisky's modern racing styled drop bar. It is equally at home on tarmac, gravel or twisty cyclocross courses. From group rides to racing, this bar is a great addition to almost any bike. The comfortable 6-degree flare provides excellent control and comfort with just enough forearm clearance from the drops. This bar features a slightly deeper drop section compared to Whisky's wider flared offerings. The reach is also slightly shorter to compensate for the now-common, longer hydraulic STI levers from many manufacturers. - Unidirectional carbon fiber construction - Measured Center-to-Center at the levers - Drop/Reach: 125/67mm - 6 deg flared drop - Clamping Torque: 5Nm

The EA70 is Easton’s top-end aluminum handlebar with traditional, round tops. The EA70 is given an upgrade with the new MCD shape technology, with grooves for brake and gear cable routing. This race-proven handlebar has won numerous Cyclocross Nationals titles and benefits from all of the aluminum construction techniques that Easton is famous for — including TaperWall technology. - Weight for 42cm bar (grams): 280 - Bar Drop (mm): 130 - Drop Bend Style: Compact - Bar Reach (mm): 80 - Material: Aluminum - Bar Top Style: Round

The ergonomic evolution of Ritchey handlebars continues with the ground-breaking WCS Beacon. The most notable feature is its super-wide 36° drop flare. Aside from the unmatched ergonomic comfort and stability afforded by this wide flare, it also allows for plenty of space for handlebar packs. When riding in the drops, the Beacon doubles down on comfort with a very shallow 80mm drop and a shorter-than-usual reach. The Evo-style top section offers broad support for your hands, and it has a gentle backward sweep for a more natural hand position when riding the tops. The unconventional aesthetic of the WCS Beacon belies its comfort and practicality. Taking inspiration from the randonneur world, the Beacon allows an easy transition of the hands around the bar without upsetting bike handling when loaded with gear. The gentle change of hand position allows the body to stretch and move while keeping the bike stable. Ideal for adventure touring and bikepacking on asphalt or gravel trails—or even for urban riding—the unique WCS Beacon brings a whole new level of comfort and control. - Material: triple-butted 7050 alloy - Bend style: bio-bend - Top style: ergonomic - Drop: 80mm - Reach: 65mm - Drop flare: 36° - Flare out: 6° - Backsweep: 4.5° - Clamp diameter: 31.8mm - Accessory mount diameter: 31.8mm - Compatible with Shimano EW-RS910 junction box - Clip-on compatibility: yes - Other features: drilled at bar end for Shimano Di2 EW-RS910 junction box routing, C260 compatible - Weight: 270g (42cm)

Tom Ritchey has been riding off-road and riding far—and designing products for such adventures—decades before anyone thought to call it "gravel riding" or "bikepacking." His real-life experiences directly inform every product made by Ritchey—such as the beloved VentureMax handlebar. With its short reach, shallow drop, and purposeful flare, the original VentureMax offers comfort and confidence to legions of riders looking to settle in and have some fun on those dirty drop bar adventures. Like the original, the Classic VentureMax is influenced by those life experiences, with some added new features—continuing to inspire riders to chase gravel and other mixed-surface adventures. Adding a touch of stylish sophistication with its high-polish silver finish, the Classic VentureMax features aero-shaped 38x22.5mm ergonomic tops for a more comfortable hand position, while drilling for a Shimano EW-RS910 junction box expands the adaptability of the WCS VentureMax. Multiple hand positions are key for comfort and confidence on any ride, and the Classic VentureMax offers plenty of options there—especially with its wide 24-degree flare at the drops. But it's the return of the Bio-bend in the drop that adds yet another design element that is practical and comfortable for whatever surface you choose to ride upon and for however long your adventure endures. - Material: double-butted 6061 alloy - Bend style: Ergo Bio-Bend - Top style: round - Width: 400mm, 420mm, 440mm, 460mm - Drop: 102mm - Reach: 76mm - Drop flare: 24° - Flare out: 6° - Back sweep: 6° - Clamp diameter: 31.8mm - Accessory mount diameter: 31.8mm - Clip-On compatibility: limited - Other features: C260 compatible - Weight: 310g (420mm)

Nearly fifty years ago, Tom Ritchey, his mentor Jobst Brandt and a group of like-minded friends would spend countless adventurous hours riding the remote trails, broken tarmac and rough gravel roads that twist through the mountains in and around the Butano State Park in northern California. Tom still rides these trails and roads today, and this topography and the pioneering rides that took place there are the inspiration for the Butano handlebar. This unique bar has proven highly sought after by legions of gravel lovers and road riders since it was introduced a few years ago. It's wide drop flare offers adventurous riders an increased level of control and confidence compared to more traditional drop bars, while its shallow drop and short reach offer a welcome amount of comfort for endless days in the rough stuff. Updated for 2021, the new Butano capitalizes on its original comfort by adding new features such as the ability for internal cable routing and a welcoming ergo-aero top section for increased hand support. The drop flare on the new Butano has also gone wider, measuring a liberal 18° for additional comfort and control. The new Butano handlebar was born from Tom's legendary riding adventures in those remote California mountains, and delivers the features you need for your own unending exploration and ceaseless journeys.

Having banked several decades of riding at least 10,000 miles per year, and still doing so, Tom has logged lots of hands-on (excuse the pun) time pondering handlebar design. And the new WCS Skyline bar is the latest result of Tom’s never-ending quest to bring the best product designs to demanding riders everywhere so that they may enjoy every pedal stroke as much as he does. Made from triple-butted 7050-T6 alloy and featuring ergonomic tops and an anatomical bend shape, the new WCS Skyline is designed for amazing road riding experiences but also shines along cyclocross courses and anywhere else you would want a comfortable and confident drop bar. Bolstering the multiple hand positions offered by the tops and anatomical bend is the shorter reach and more shallow drop of the Skyline. But the key to the sublime ergonomics of the Skyline is its progressive reach and drop depending on the width of the bar - offering true ergonomic consistency across all sizes. This combination makes the WCS Skyline the most ergonomic Ritchey road bar on offer.

Built from a lifetime of riding and racing experiences and inspired by life itself, the latest generation of the Ritchey Comp Streem brings fully internal cable routing to this legendary handlebar. The Streem bar has long combined the performance and advantage of an aero bar with all-day comfort. A generous aero-formed top section provides sleek performance and ergonomic support. While its comfort is bolstered by the stress-relieving compact drop, ever so gentle back sweep, and slight drop flare, its increasing radius drops offer multiple hand positions. Now updated with the ability for fully internal cable routing, the new Comp Streem ups its advantages to fortify its position as the perfect choice for road racers and serious enthusiasts who demand performance without sacrificing comfort in the everlasting quest for great ride experiences. - Internal cable routing - Compatible with Shimano EW-RS910 junction box - Increasing radius drops - Material: double-butted 6061 alloy - Bend style: compact - Top style: ergonomic - Width: 380, 400, 420, 440, 460mm - Drop: 128mm - Reach: 73mm - Drop flare: 2° - Backsweep: 5° - Clamp diameter: 31.8mm - Accessory mount diameter: 31.8mm - Compatible with Shimano EW-RS910 junction box - Cable routing: full or partial internal - Clip-on compatibility: yes for all sizes except 38cm - Other features: Di2 cable internal routing—C260 compatible - Weight: 297g (42cm)

The ergonomic evolution of Ritchey handlebars continues with the ground-breaking Comp Beacon. The most notable feature is its super-wide 36° drop flare. Aside from the unmatched ergonomic comfort and stability afforded by this wide flare, it also allows for plenty of space for handlebar packs. When riding in the drops, the Beacon doubles down on comfort with a very shallow 80mm drop and a shorter than usual reach. The Evo-style top section offers broad support for your hands, and it has a gentle backward sweep for a more natural hand position when riding the tops. The unconventional aesthetic of the Comp Beacon belies its comfort and practicality. Taking inspiration from the randonneur world, the Beacon allows an easy transition of the hands around the bar without upsetting bike handling when loaded with gear. The gentle change of hand position allows the body to stretch and move while keeping the bike stable. Ideal for adventure touring and bikepacking, on asphalt or gravel trails—or even for urban riding—the unique Comp Beacon brings a whole new level of comfort and control. - Material: double-butted 6061 alloy - Bend style: bio-bend - Top style: ergonomic - Width: 400, 420, 440, 460mm - Drop: 80mm - Reach: 65mm - Drop flare: 36° - Flare out: 6° - Backsweep: 4.5° - Clamp diameter: 31.8mm - Accessory mount diameter: 31.8mm - Compatible with Shimano EW-RS910 junction box - Clip-on compatibility: yes - Other features: drilled at bar end for Shimano Di2 EW-RS910 junction box routing, C260 compatible - Weight: 300g (420mm)

WCS VentureMax Drop Handlebar - Evo sweep of 6 degrees - 24 degrees of flare - Ergo Bio-bend - Compatible with all hood types

We threw in a bit of everything for our take on the ultimate gravel handlebar setup. Rise, sweep, and flare make for an ultra-comfortable handlebar that keeps you in control no matter the terrain. Add the Cruise Control Top and Drop Grips and our Really Long Bar Tape to get to next-level comfort and performance. For the rider that wants to go everywhere, the Kitchen Sink Handlebar is the bar that has everything. With widths from 44 cm up to 50 cm, it's clear we believe in wide. But the added stability and control of a wider bar should not come at the cost of comfort. So we've thrown everything into this handlebar: - 20mm RISE means less pressure on the hands and a broad range of fit options. - 7° SWEEP means the bar is positioned where your hands want to be, whether you're on the flats, the hoods or the drops. - 25° FLARE on a compact drop means a stable, aerodynamic drop position that is actually comfortable enough to use. - Optional endurance loop adds an alternative aerodynamic riding position and a perfect spot for gear storage and mounting accessories.

Zipp Service Course SL 80 Ergo handlebar is all about making you faster in style and comfort. The bar offers an 80mm reach and 125mm drop, perfect for a rider looking for a medium reach and shallow drop who likes reaching down to, rather than into, the drops. This bar has a flattened top and 3° backsweep for a neutral wrist position on the tops. The bars feature a 7° ramp angle for a flat transition to the hoods and a 4° outsweep at the drops. In addition to the ergonomic benefits, the Service Course SL 80 Ergo is our first ergo bar to be clip-on compatible. Made of 7050 aluminum, the Service Course SL 80 Ergo weighs 275g for a 42cm-wide bar. Light weight, stiffness, and comfort: the Zipp Service Course line provides the right fit for all rider types. - Distinctive Zipp cosmetics - 7050 aluminum for light weight and durability - 80mm reach and 125mm drop for a medium-high position - Flattened top shape with 3° backsweep for comfort - Clip-on Compatible (40, 42, 44cm sizes only) - Di2 RS910 junction compatible - Lifetime warranty

The all-new Rapide Cockpit is a lot more than just the fastest way to the finish line. It's the fastest leading edge we've ever made, putting aero gains in the clean air, where they matter most and shaving four watts off the already ultra-quick two piece Rapide Bar and Tarmac SL7 Stem. But to deliver a leading edge that provides a winning edge takes more than pure aero. The goal for the Roval engineering team was simple—the Rapide Cockpit had to be the fastest bar we've ever made, with no compromises. It's aero, light, stiff, and designed hand-in-hand with the best riders in the world and our Retül fit experts so you can get a grip on victory. AERODYNAMIC: Removing the cluster of hardware (where stem and handlebar connect) allowed us to design the bar's leading edge a single airfoil. We optimized this airfoil to provide a maximum advantage in clean air at speeds seen from long solo breakaways to full gas World Tour sprints. While a four watt improvement may seem small, it adds up to a 32cm lead over a 250m final sprint. When races are won by bike throws, this is a winning difference. LIGHT AND STIFF: By removing the stem's hardware cluster the Rapide Cockpit is 50 grams lighter (100mm x 420mm) than a two piece Rapide bar and Tarmac SL7 combo. Made from premium high-modulus carbon fiber, that delivers ideal stiffness for the biggest, fastest sprinters on the World Tour, the Rapide Cockpit has a higher stiffness-to-weight ratio than any two piece system we've ever made. FIT: The downside of one-piece cockpits has long been fit, but we partnered with our Retül fit professionals and the best riders in the world to ensure almost every rider can find their fit. We offer 15 different stem and bar combos, all at -6 degree, so we've got your race day position covered. The radius from tops to drops has been sculpted for wrist clearance whether out of the saddle in a final sprint or tucked in an aero position, while bend and flare reflect our favorite Rapide bar. - Aerodynamically engineered to save 4 watts vs a traditional aero road bar - Material: Premium High Modulus Carbon Fiber, Titanium Stem Bolts - Sizes: 15 combos from (75mm x 380mm) to (125mm x 440cm) - Bend: 125mm drop x 75mm reach, 4 degrees of flare at the drops - Stem Angle: 6-Degrees - Steer Clamp Diameter: 31.8 - Weight: 310 grams (100mm x 420mm) - Cable Routing: Shimano, SRAM, Campagnolo ( Internal/Electronic Compatible) - Compatible with Roval bolt on computer mount, S219900058. - System Weight Limit: 275lbs/125kg

The DRV/AEROa is a high-performance aluminum aero drop bar featuring a truncated airfoil for aerodynamics, comfort and stiffness. The curve has been optimized for modern road levers. The innovative fit and ergonomics of the DRV system include a 7° ramp angle and a 4° flare in the drops, allowing a natural wrist angle for enhanced comfort and control. The DRiVe metric by Profile Design pinpoints the precise position in the drops where riders instinctively place their hands. The metric is incorporated into a new series of progressively sized handlebars designed around a cyclist's most powerful hand positions. What is your DRiVe? Gone are the days of simply measuring a drop bar by the standard reach, drop and width. Our DRiVe metric pinpoints the precise position in the drops where riders instinctively place their hands. The metric is incorporated into a new series of progressively sized handlebars designed around a cyclist's most powerful hand positions. - The DRiVe Metric: The DRiVe (Drop Reach Variant) position is measured via a 73° line beginning at the bar bore. The DRiVe metric pinpoints the line intersection with the drop. - DRiVe Reclaims Comfort, Power & Control: Modern drop bar designs are deeply tied to tradition. They are designed based on outdated road bike sizing rendering many of cycling intended hand positions unattainable when riding modern frame geometry. The ride positions that are the most powerful and allow for the most control have now shifted into virtually unattainable positions. DRiVe reclaims many of the ideal positions most critical to comfort, power, and control. - Fit Made Simple: To predict the DRiVe position of any given rider, we looked at an anthropological study focusing on the correlation among handbreadth, shoulder width, and height. By measuring your handbreadth we can easily identify a DRiVe that will be compatible with your body type. - Progressive Ergonomics: The tops and hoods complement the powerhouse DRiVe position and the Reach and DRiVe are progressively sized as the bar increases in width. This progressive sizing ensures the most powerful positions remain right where they are needed. - Weight: 315g (38cm) - Size: 36, 38, 40, 42, 44cm (center to center) - Reach: 70, 75, 80mm - Clamp Width: 100mm - Clamp Diameter: 31.8mm - Clip Compatible: Yes - Drop: 122mm, 136mm, 148mm - Drop Outsweep: 4° - Drive: 105mm, 120mm, 135mm - Internal Cable Routing: Yes (Mechanical / Di2) - Max Brake Lever Torque: 10Nm - Max Torque Clamping to Bar: 6Nm - Material: 6061-T6 AL

The EC90 SLX is comprised of advanced carbon construction for Easton’s lightest road bar to-date. This handlebar features Easton’s new MCD shape technology for a unique ride quality and comfort. TaperWall technology and Intelligent Flexibility team up to deliver a perfectly tuned bar that weighs just 195-grams. Shimano, SRAM or Campagnolo levers can be positioned for a smooth transition on the tops and into the bend, with cables wrapped neatly in the bar’s designed recesses. - Bar weight: 195mm (42cm) - Width (center-to-center): 38cm, 40cm, 42cm, 44cm, 46cm - Clamp diameter: 31.8mm - Reach: 80mm - Drop: 125mm - Materials: EC90 carbon

- Steve Potts and the other founders of WTB originated the first "dirt drop" style bar for Specialized back in the late 1980's. Steve Potts designed this modern version with updated fit and function. - Polished aluminum finish in black and silver - Made by Nitto in Japan

- Integrated front extension provides additional hand positions - Designed and intended for all types of drop bar riding - Traditional drop bar shape with no flair to the drops - Lightweight 6061-T6 alloy construction - 439g (42cm)

- Double-butted 6061-T6 aluminum construction - RHM Shallow-ergonomic profile with more hand positions than traditional anatomic shapes - Black anodized - Drop/reach are measured center-to-center, width is measured outside-to-outside - 280g (42cm)

- 6061-T6 aluminum construction - A great choice for any Gravel or Adventure bike setup - 10-degree backsweep angle and 5-degree downsweep - 10mm rise is an additional help to get the desired handlebar stack height - 24-degree flare and 3-degree outsweep at the drops offers superior stability

For the ultimate in comfort and control over long distances, our all-carbon Scully Bar pairs a 5-degree upsweep with a 23-degree backsweep. Featuring an elegant forward bend before sweeping back again, its easy, natural hand position inspires confidence. It’s also blissfully wide, offering loads of real estate up top for mounting lights, bags, bikepacking gear, and more. ISO tested for harsh terrain, the Scully Bar is a sleek and stiff upgrade for paved commutes and whatever off-road riding you’re into — gravel, XC, singletrack, and beyond. Offered with 20mm of rise in two trimmable widths, the ideal fit is out there.

Easton’s new AX series line of bars meets the needs of the growing drop bar adventure and gravel segment. Building off the highly successful and critically acclaimed line of new MCD road bars and EA70 and EC70 AX bar utilizes the same top shape and reach as well as the ergonomic drop shape but turns up the drop flare from 4 degrees all the way up to 16 degrees. The wider stance in the drops provides more control on rough terrain and long gravel assaults. Why 16-degrees? Based on extensive testing and rider feedback we determined that 16 degrees was the perfect balance of maximum bar flare that still allowed for efficient access and usage of the shifters and brakes in both the hoods and drops. - Width (center-to-center): 40cm, 42cm, 44cm, 46cm (+68m at drops) - Flare: 16-degrees - 42cm: 220g - Clamp diameter: 31.8mm - Reach: 80mm - Drop: 120mm - Materials: EC70 carbon

Flared Adventure and Gravel bar made of EC90 carbon composite - 16 degrees of flare (adds 68mm to bar width at tip of drops) - Each width of bar has a unique diameter and length ergonomic top section - Maximum Contact Drop (MCD) shape for comfort and control - Internal routing for Di2 wiring - 208g @ 42cm (width measured center-to-center)

Flared Adventure and Gravel bar made of EC90 carbon composite - 10 degrees of flare (adds 68mm to bar width at tip of drops) - Ergonomic top section and size-specific shape to optimize strength, weight and ride feel - Maximum Contact Drop (MCD) shape for comfort and control - Internal routing for Di2 wiring - 205g @ 42cm (width measured center-to-center)

Triple-butted 7075-T6 aluminum construction with provisions for STI/Ergopower cable routing\n- Rapid Hand Movement (RHM) bend with a patented Continuous Incremental Radius design provides a modern, shallow-ergonomic profile with more hand positions than traditional anatomic shapes - Drop/reach are measured center-to-center, width is measured outside-to-outside (O-O) - The drops flare outward at 12 deg angle and extend the width (O-O) an additional 60mm. 260g (42cm)

30-degree accentuated drop flare that allows for excellent control while riding off-road - Provides additional space for bar bags - 6061 T6 butted aluminum, 310g