The SunRace MZ800 is a 12-speed cassette with a dental ratio of 11-51. It's the perfect solution for cyclists who don't have an XD-less wheel and want to enjoy a smooth 1x12 gear. This cassette is fully compatible with the standard hunction and works with Shimano 12-speed systems and SRAM XX1 Eagle, X01 Eagle and GX Eagle Achterdailleurs with 12 gears. With the MZ800, you can switch effortlessly between different sites and enjoy precise, reliable acceleration performance. Features: - Use: MTB - Suitable for FreeHub: Shimano - Suitable for: 12 gears - Teeth: 11-51 -Vertissant: 11-13-17-19-21-24-28-33-39-45-51 - Color: silver - Weight: 660 grams (manufacturer's information)