Sram PG1030 10 Speed Cassette - 

The PG-1030 Cassette offers an innovative approach to 10-speed cassette design. Our cassette performance is optimized by material choice, tooth profile and shift ramp design for quick and positive index shifting.

Features
Durable heat-treated, nickel-chrome plated steel cogs with weight reduction windows
PowerGlide tooth profiling designed for smooth/fast shifting performance (36t max for mountain derailleurs)
Fits 8/9/10sp* SRAM/Shimano-spline freehub bodies for 10-speed shifting/spacing
Includes steel lockring