The SRAM NX Eagle PG-1230 Cassette is a high-quality 12-speed cassette designed for mountain bikes. Made of durable stainless steel, this black cassette includes a 11-tooth smallest sprocket and a 50-tooth largest sprocket. It is compatible with SRAM brand components and Shimano HG freehub/driver type. This new cassette by SRAM is a reliable choice for cyclists looking to upgrade their bike's performance.