Chromag Sequence DM chainring, 28T - black CNC Machined from 7075T6 aluminum for durability Official SRAM X-SYNC technology. Complies with SRAM warranty standards for compatibility with all SRAM X-SYNC drivetrain Chamfered mud-clearing recesses at the base of the teeth provide the best possible performance in muddy conditions Ring Position/TYPE: Chain Retaining Single Ring Drivetrain Speeds: 10