Built out of 416 Stainless Steel, these rings are designed to last and feature extreme durability. These rings feature Drop-Stop tooth profiles for mud clearance, chain retention and durability. Features: Features Wolf Tooth's Drop-Stop tooth design for maximum chain retention Optimized for use with 10, 11, and 12 speed chains (can be used for a 9 speed drivetrain with a 10 speed chain) Made out of 416 Stainless Steel for superlative durability Drop-Stop A: works for nearly all 10-12 speed chains. Not compatible with Shimano 12 speed, SRAM Flattop, and Campagnolo Specifications: Chainring Shape: Round Drive Type: 1x Speed Compatibility: 10 Speed, 11 Speed, 12 Speed Chainring BCD: 104mm Mount: 4-Bolt Material: Steel Color: Silver Weight: 72g (30T), 88g (32T)