Direct mount oval crankset compatible with Shimano XTR M9100, XT M8100 and SLX M7100 direct mount cranks.Wolf Tooth chainrings feature our patented Drop-Stop® design for best chain life, chain retention and sludge cleanliness.Features:Use:Mtb.Mounting:Direct Mount.Chain Compatibility:Drop-Stop ST.Weight according to sprocket:32t - 66g 34t - 72g 38t - 81g.Material:Aluminum 7075-T6.Manufactured:in the USA .Color:Black.Compatibility:Shimano XTR M9100, XT M8100 and SLX M7100 12-speed cranksets.Super Boost cranksets - M8120, M8130, M7120 and M7130 models - use the Boost crankset.These Super Boost cranksets have a longer axle and do not use the Super Boost chainring.These cranks and ring should ONLY be used on bikes with Super Boost rear hub spacing (157mm).Boost cranksets (M9100, M8100, M7100, MT610 models) will use a Boost ring with Boost rear hub spacing (148mm) and a Super Boost ring with Super Boost rear hub spacing (157mm).Chain compatibility:Drop-Stop ST for Shimano Hyperglide+ 12-speed and KMC 12-speed chains.