The Original one and only absoluteBLACK Premium Shimano 12spd Hyperglide compatible Direct mount 1X Oval chainrings are designed for XTR M9100, XT M8100, SLX M7100 & Deore M6100 cranks. Super smooth pedaling experience. This chainring is specifically designed to work with CN-M9100, 8100, 7100 & 6100 Shimano 12spd Hyperglide chain due to different thickness of the teeth. It is the most Premium oval chainring on the market with scientifically proven performance gains.