Deckas Chainring For 12S Shimano M9100 M8100 M7100 oval 32 34 36 38T Narrow Bike Wide Direct Mount Chainwheel Bicycle PlateMaterial: Aerospace Aluminum 7075-T651Color: black, anodizedSpeed: 9/10/11/12 SpeedThickness:6MMChainline:52mmOffset 3mmFit for: for shimano M9100 M8100 M7100,MT-900 CrankSuitable for Boost 148 frameWeight: 70-100gPackage Contents:1 x bike Chainring