Stem ST008-3K Material: ALLOY-T6 + Carbon Fiber Dia:11/828.6MM Angle:+/-8° Bar Bore:31.8mm Weight:160G Extension: 80/90/100/110mm Weave:3k/12k/udWe supply Various Bike Parts, Carbon and Alloy Composite Stem, ST008-3K, ALLOY-T6 + Carbon Fiber material.