The Zipp Service Course SL Stem, crafted from 7075 aluminum, features a shape that’s strong and lightweight, resulting in a 1.85 grams per newton meter of stiffness. That results in no-flex sprints and accelerations. FEATURES: Forged AL-7075 Machined and relieved faceplate Features titanium hardware with TORX heads on all bolts for precision torque readings and ease of adjustment SPECS: Material: Aluminum S.H.I.S. Stem Clamp Diameter: 28.6 Length: 100 Bar Clamp Diameter (mm): 31.8 Defined Color: Black Stack Height: 41 Weight: 125 Stem Angle (deg): +6 , -6