Feature: 1. This cassette is a cassette sprocket for mountain bike. 2. Adopted the hollow design, with chrome plating surface, no fading. 3. Constructed of high-strength steel and manufactured using quenched and tempered technology. 4. The strong antioxidation makes it hard to rust, can provides long service life. 5. Easy to control the shift function, due to the special design of the gear sprocket exclusively for mountain bike. 6. There are two types for you to choose, 9 speed and 10 speed, you can choose according to your demands. Specification: This is a cassette sprocket for mountain bike, which is adopted the hollow design, with chrome plating surface, no fading. Constructed of high-strength steel and manufactured using quenched and tempered technology. The strong antioxidation makes it hard to rust, can provides long service life. Easy to control the shift function, due to the special design of the gear sprocket exclusively for mountain bike. There are two types for you to choose, 9 speed and 10 speed, you can choose according to your demands. You can have a try. Features: This cassette is a cassette sprocket for mountain bike. Adopted the hollow design, with chrome plating surface, no fading. Constructed of high-strength steel and manufactured using quenched and tempered technology. The strong antioxidation makes it hard to rust, can provides long service life. Easy to control the shift function, due to the special design of the gear sprocket exclusively for mountain bike. There are two types for you to choose, 9 speed and 10 speed, you can choose according to your demands. Specifications: Name: ZTTO Cassette Material: steel Color: Gold Type: 9 speed, 10 speed (optional) 9 speed ratios: 11-13-15-18-21-24-28-32-36T 10 speed ratios: 11-13-15-17-19-21-24-28-32-36T Item weight: 9 speed: 415g / 0.91lb 10 speed: 439g / 0.97lb Package size: 155 * 155 * 60mm / 6.10 * 6.10 * 2.36in Package weight: 9 speed: 498g / 1.10lb 10 speed: 522g / 1.15lb Packing List: 1 * Cassette Package List: 1 * Cassette