`- Designed specifically for Shimano 12 speed HG+ chains\n- CNC machined aluminum ring fits Race Face cranks with Cinch System \n- Engineered proprietary tooth profile maintains the quiet and smooth performance of the HG+ drivetrain with legendary Wolf Tooth chain retention\n- Prevents premature ring and chain wear that can come from non-optimized profile \n- Made in the USA from 7075-T6 aluminum alloy