These chainrings are Shimano direct mount cranksets and are designed for 1x set ups. The Wolf Tooth chainring features Wolf Tooth’s patented Drop-Stop ® design for the best chain retention, wear life, and mud clearance. Wolf Tooth’s patented Drop-Stop ® technology Designed for 1x set up Weight: 66g (32t), 72g (34t) Material: 7075-T6 aluminium Made in the USA Compatibility - Shimano XTR M9100, XT M8100, and SLX M7100 series 12 speed cranksets. Super boost cranksets -models M8120, M8130, M7120 and M7130 - use the Boost chainring. These Super Boost cranksets have a longer spindle 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 - models M9100, M8100, M7100, MT610 - will use a Boost ring with Boost rear hub spacing (148mm) and a Super Boost ring with Super Boost rear hub spacing (157mm). Suitable for all 9, 10, and 11spd chains or 12spd SRAM Eagle, KMC, Connex or Wippermann chains.