The Zipp Service Course SL Stem, crafted from 7075 aluminum, features a shape that strong and lightweight, resulting in a 1.85 grams per newton meter of stiffness. That results in no-flex sprints and accelerations. Forged AL-7075. Machined and relieved faceplate. Features titanium hardware with TORX heads on all bolts for precision torque readings and ease of adjustment. Item Specifications: Stem Angle (deg): +6, Stem Angle (deg): -6, S.H.I.S. Stem Clamp Diameter: 28.6, Defined Color: Black, Stack Height: 41, Weight: 123, Color: Matte Black, Material: Aluminum, Length: 140, Bar Clamp Diameter (mm): 31.8,