Dimension cassettes feature Shimano/SRAM compatible spacing, precise fitment for crisp shifting, and easy installation with standard tools. They're a perfect replacement for worn out cogs. Constructed of steel cogs and lock ring. Cassette Cogs: - 11 - 28T: 11-13-15-18-21-24-28 - 12 - 28T: 12-14-16-18-21-24-28 - 12 - 32T: 12-13-15-18-21-24-32