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Zipp Service Course SL Stem - 100mm 31.8 Clamp +/-6 1 1/8" Aluminum Matte BLK B2 Weight-560g }TRP Disc Brake Pads -Zipp Service Course SL Stem 100mm 31. 8 Clamp + 6 1 1 8" Aluminum Matte Black B2. The Zipp Service Course SL Stem crafted from 7075 aluminum features a shape thats 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