Race Face 1x 104 BCD Hyperglide+ Chainring Race Face Narrow Wide Hyperglide+ 1x chainrings are made of 4mm thick 7075-T6 alloy plate for stiffness and strength. Features Only compatible with Hyperglide + chains Designed for use with 12-speed Shimano drivetrains Narrow Wide tooth profiling ensures consistent chain retention SPECIFICATIONSMaterial Aluminum Round or Oval Round Tooth Count32Ring Position/Type Single Drivetrain Speeds12Chainring BCD104MFG#RNW104X32TSHI12BLK | Race Face | Raceface 1X 104 Bcd Hyperglide+ Chainring 32T 104 Bcd 4-Bolt 12S Hyperglide+ 7075 Alu Black | Aluminum