These Wolf Tooth stainless steel single speed cogs feature extra tall teeth for reliable chain retention when using chain tensioners and are machined from 416 stainless steel billet with heat treating and electropolishing post processing for durability and corrosion resistance.Item weight: 35gMade from hardened and electropolished 416 stainless steelOptimized for use with 9,10,11 speed chains, but suitable for use with some 12-speed chainsReversible and 4.5mm wide at the base to help prevent cog from damaging your freehub bodyFits Shimano Hyperglide style freehub splinesNot compatible with Shimano Microspline or SRAM XD freehubsNot compatible with Campagnolo 13-speed chainsItem SpecificationsCassette Body TypeShimano HGDefined ColorSilverDrivetrain SpeedsSingle Speed 3/32"MaterialStainless SteelTooth Count18 Wolf Tooth Stainless Steel Single Speed Cog Driver and Single Cog UPC: 812719021753