7075-T6 aluminum direct mount ring to fit Race Face Cinch system splined cranks Narrow-wide teeth prevent chain drop, updated tooth profile runs quieter Compatible with 9-12 speed chains, allowing a 1X set up on most any drivetrain Installs with a common Park Tool BBT-22 TECH SPECS ring type single (anti-chain drop) mount Cinch DM 3mm offset teeth 30t oval/round round color orange