FSK 0S99 3D FORGED AL7050 Carbon Fiber Bike Bicycle Cycle MTB Stem 31.8mm* 60/70/80/90/100/110mm (Red&Green) (Red, 80mm) Material: 3K carbon weave on middle positon +Alloy2014 Bar Clamp Diameter : 31.8mm 4-Bolt Faceplate Steerer Diameter: 1-1/8" (28.6mm) Stem Length: 60/70/80/90/100/110mm Stem Angle: +6/-6, Weight: approx 125g(100mm)