This SunRace cassette ratio is suitable for mountain bikes with 11-speed gears. The CSMS8 model has a wide ratio and uses Fluid Drive Plus technology for smooth shifting. The 11-46T tooth combination provides a wide range of gears. The cassette is made of high-quality materials, with an aluminum spider, spacer, and cog that are anodized black. The sprockets are made of Hi-Tensile Steel and have a metallic silver finish. With milled holes for weight reduction, this cassette weighs just 534 grams. Product specifications - Model: CSMS8 - Gears: 11 (wide ratio) - Function: Fluid Drive Plus - Toothing: 11-46T - Tooth combination: 11-13-15-18-21--24-28-32-36-40-46 - Material: - Spider, spacer and closing ring: Aluminum / black anodized - Sprockets: Hi-Tensile Steel - Finish: Metallic silver - Milling holes for weight reduction: Yes - Weight: 534 grams