Wolf Tooth Elliptical Cinch Direct Mount Ring. Features: Elliptical shape for improved power transmission CNC machined aluminum ring fits Race Face cranks with Cinch System Features Drop-Stop tooth design to prevent unwanted chain drop Asymmetrical tooth shape for the best wear life, chain retention and mud clearance. 49mm chainline vs. stock Cinch 51mm chainline Recommended for use with 10 or 11sp chain (10sp chain works on 9sp drivetrain) Made in the USA from 7075-T6 aluminum alloy Specs: Ring Type:single (anti chain drop) Armx BCD:Cinch direct mount Teeth:34t Color:black