The BA0305A SunRace Cassette 11sp is a high-quality cassette from SunRace. This cassette has 11 gears with a wide ratio, ensuring smooth shifting. The cassette features Fluid Drive Plus technology, ensuring smooth and efficient gear changes. With a tooth ratio of 11-36T, this cassette offers a wide range of gears for various terrains. The spider, spacer, and locking ring are made of black anodized aluminum, while the sprockets are made of Hi-Tensile Steel for durability. The cassette is finished in a stylish black color and features milled holes for weight reduction. Weighing just 360 grams, it's a lightweight option for cyclists seeking optimal performance. Product specifications - Model: CSMS8 - Gears: 11 (wide ratio) - Function: Fluid Drive Plus - Toothing: 11-36T - Tooth combination: 11-12-13-15-17-19-21-24-28-32-36 - Material: - Spider, spacer and closing ring: Aluminum / black anodized - Sprockets: Hi-Tensile Steel - Finish: ED black - Milling holes for weight reduction: Yes - Weight: 360 grams