"10 Speed Freewheel for Mountain Bikes This 10 speed cassette is made of high quality steel, high strength, anti-rust, non-deformation, wear-resistant and durable.Its high-precision thread ensures a close connection with the bicycle hub. It is specially designed for 10-speed bicycles to ensure that the chain rotates smoothly. It is suitable for chain links between 11-42T to help increase the riding speed and provide a faster and safer riding experience. Tooth range: 11-42T; 10 Speed Wide Ratio Cassette Gear Combination 10 Speed:11-13-15-17-19-21-24-28-32-36T 10 Speed:11-13-15-18-21-24-28-32-36-40T 10 Speed:11-13-15-18-21-24-28-32-36-42T 10 Speed:11-13-16-20-24-28-32-36-40-46T 10 Speed:11-13-16-24-28-32-36-42-46-50T Color: As pictured Compatibility: Such as Shimano Kit 10 Speed DEORE M590, M610, M6000, SLX M670, M675, XT M780, M785 and SRAM Kit 10 Speed X5, X7, X9 Designed for a 10 speed bike. Compatibility: Shimano/SRAM This 11-42T cassette is an ideal choice for mountain bike riders who want the simplicity of a 1x10 drivetrain, yet still, have a wide range of climbing gears. Offering you great value for money, it enables you to clean up your handlebars and frame by losing the front shifter and mech, all without the expense of an expander sprocket. Note: Under the premise, it must be matched with conventional cassette hub body"