•【Durable Construction】Crafted with aluminum alloy + steel, this cassette combines robustness with reduced weight. Its durable materials ensure long-lasting performance even under demanding mountain biking conditions •【Wide 12-Speed 9-51T Range】This 12-speed XD cassette offers a versatile 9-51T gear range, making it ideal for tackling steep climbs and achieving high speeds on descents. Whether you're navigating rugged mountain trails or smooth singletrack, this gear ratio provides the precision and flexibility needed for optimal performance •【Precision CNC Machining】The cassette is expertly crafted using CNC integrated machining, ensuring a lightweight, visually appealing design without compromising durability. This high-precision process delivers smooth shifting performance and seamless gear transitions, helping you stay focused on the ride •【Compatible with XD Freehubs】Specifically designed for XD standard freehub bodies, this cassette is a perfect fit for a wide range of mountain bikes •【Optimized for Versatile Riding】Engineered for various terrains and biking styles, this XD cassette suits all XD-compatible hubs. Whether you're a competitive racer or a recreational rider, this cassette ensures reliable and efficient gear changes, enhancing your cycling experience Specifications: •Material: aluminum alloy + steel •Speed: 12-speed •Teeth: 9-51T •Weight: 296g Package included: •1 x Freewheel Sprocket