Wolf Tooth Elliptical Cinch HG+ Chainring. Features: Designed specifically for Shimano 12 speed HG+ chains Elliptical shape for improved power transmission CNC machined aluminum ring fits Race Face cranks with Cinch System Engineered proprietary tooth profile maintains the quiet and smooth performance of the HG+ drivetrain with legendary Wolf Tooth chain retention Prevents premature ring and chain wear that can come from non-optimized profile Made in the USA from 7075-T6 aluminum alloy Specs: Ring Type:HG+ (anti-chain drop) Armx BCD:Cinch direct mount (Boost) Teeth:30t Color:black