SRAM PG 850 MTB Cassette

"With the introduction of the SRAM 5.0 Powerglide II Cassette, a complete high-performance SRAM drivetrain is now possible. This cassette delivers optimum performance in any condition.SRAM's patented Powerglide II Technology provides precise shifting and excellent wear. With a lightweight, efficient and stiff design, these cassettes deliver maximum accuracy. Their durable construction of high-quality steel cogs and lasting heat treatment allow nearly unlimited abuse. The 5.0 Cassette is an excellent match with a SRAM Power Chain, but delivers optimum performance with all other chains. Specify 11-28 or 11-32."