The SunRace 9-speed R91 cassette is an excellent choice for cyclists looking for flexible, reliable shifting performance. With 9 gears and a cassette ratio of 11 to 25 teeth, this cassette offers a wide range of shifting options. -A quality product, this cassette is durable and wear-resistant. The super-smooth drive function ensures smooth, fast switching actions, so you can effortlessly switch between different gears. Weighing in at just 284 grams, this cassette is also lightweight, so it doesn't contribute much to the overall weight of your bike. The SunRace 9-speed R91 cassette is an excellent choice for recreational and serious cyclists. Product specifications: - Gears: 9 speed - Cassette ratio: 11-25 teeth - Color: silver - Material: steel - Depth: 41 mm - Weight: 283 grams