R1TCHG-Y WCS Carbon Fiber Bike Bicycle Cycle MTB Stem 31.8mm* 80/90/100/110mm Material: 3K carbon weave on middle positon + Alloy2014 Body & Cover Bar Clamp Diameter : 31.8mm 4-Bolt Faceplate Steerer Diameter: 1-1/8" (28.6mm) Stem Length: 80/90/100/110mm Stem Angle: +7/-7, Weight: approx 125g(100mm)