The Shimano CS-HG80 9 Speed SLX Cassette is designed to give you high quality performance at a reasonable price. The CS-HG80 9 Speed SLX Cassette features Shimano's Hyperglide sprockets to give this cassette specifically positioned ramps and tooth profiles to give you faster and more responsive shifting. The CS-HG80 9 Speed SLX Cassette is made of steel to make it durable and the chrome/nickel finish helps extend the life of your cassette. The sprocket sizes are 11-13-15-17-20-23-26-30-34. This cassette features an 11-34 ratio and includes a lockring.