:9 Speed Cassette 11‑42T Freewheel Cassette Cassette Sprocket W/ 2 Sprocket.

Feature: \n 1. The flywheel rotates steadily without noise, ensuring a close connection with the bicycle hub and smooth operation.\n2. Made of high\u2011quality metal material, it has good corrosion resistance and heat resistance.\n3. There is no need to worry about long\u2011term use of friction and heating, which will affect its service life.\n4. With a hollow design, the weight is reduced, and it will not add too much burden to your bicycle when using it.\n5. It has high strength, strong durability and abrasion resistance, compatible with 9\u2011speed mountain bike for HG system. \n\nSpecification: \n\nItem Type: Freewheel Cassette\nMaterial: Chrome-Molybdenum Steel (nickel-plated surface treatment)\nProduct Color: As Pictures Shown \nProduct Weight: Approx. 625g / 22.0oz\nGear Ratio: 11-42T (11-13-16-20-24-28-32-36-42T)\nCompatibility: For 9-speed mountain bike for HG system\n\nPackage List: \n1 x Flywheel\n2 x Sprocket\n1 x Flywheel Cover \n\nNote: \n After the installation is c: