This chainring's tooth profile was developed specifically for Shimano's XTR, XT, and SLX 12-speed Hyperglide+ chain. Features: Compatible only with Hyperglide+ 12-speed chain For use with Wolf Tooth CAMO spiders (not compatible with any other chainring mountings) Elliptical rings provide smoother, more efficient pedal rotation, which means better traction Maintains quiet and smooth performance of the Hyperglide+ drivetrain with exceptional chain retention Prevents premature ring and chain wear that can come from non-optimized profiles Specs: Drivetrain Speeds12 Defined ColorBlack Direct Mount TypeWolf Tooth CAMO Tooth Count32 MaterialAluminum Round or OvalOval