Product details:

The Sunrace CSMX8 is a wide range, 11-50T cassette that fits a standard Shimano driver. This means that you don't have to upgrade to a SRAM specific XD driver in order to run an expanded gear range. The CSMX8 differs from Sunrace's other cassettes in that it has alloy spacers and an alloy lock-ring, which saves weight over steel. Fluid Drive Plus tooth design mimics Shimano's Hyperglide ramps and pins to keep shifting smooth and quiet, and a black coating increases durability and longevity of the cogs.