Pro Taper Vice Stem Highly Durable On the surface, the Pro Taper Vice Stem may look simple, but under that beautiful veneer lies hours of 3D modelling, countless revisions, and tons of real-world ride testing. All of this is done to provide a light, stiff stem that can handle tremendous forces from every conceivable angle. Features3D forged and machined 6061 alloy construction Designed for enduro, all-mountain, and trail riding Weight: 175g (30mm)SPECIFICATIONSLength30, 40, 50mm Rise Zero Bar Clamp Diameter31. 8mm Stack-Material Machined 6061 Alloy Intended Use Trail, All-Mountain, Enduro Weight175g (30mm) | Protaper | Vice Stem | Black | 31. 8Mm, 40Mm | Aluminum