This mountain bike cassette is made of metal and is suitable for use on a mountain bike. It has a cassette ratio of 11-40 and is model CSMS8. This cassette has 11 speeds and uses Fluid Drive Plus technology. The virtue is 11-40T and the tooth combination is 11-13-15-17-19-21-24-28-32-36-40. The cassette is made of high-quality materials, with an aluminum spider, spacer and anodized knoskrans. Dental crowns are made of Hi-Enile steel. The cassette has a metallic silver finish and is equipped with countersunk holes for weight reduction. The weight of the cassette is 429 grams. Product specifications: - Model: CSMS8 - Gears: 11 (wide ratio) - Function: Drive Fluid Plus - vertu: 11-40T -Dandement: 11-13-17-19-21-24-28-32-36-40 - Material: - spider, spacer and knoskrans: aluminum / black anodized - Dental crowns: hi-enile steel - Finish: Silver Metallic - free holes for weight reduction: yes - Weight: 429 grams