MTB direct mount chainrings with 6mm offset Narrow/Wide tooth design for chain retention on 1x systems 10, 11, or 12 speed compatible Forged and hard anodized AL6061-T6 alloy construction SRAM 3-bolt interface for crank arm mounting Direct Mount 28T 1x AL6061 GXP Black 10/11/12s Narrow/Wide 6mm