Feature: 1. The bicycle flywheel has high temperature resistance, corrosion resistance, abrasion resistance, and strong impact resistance. 2. Bike Cassette has high durability, antirust, no deformation, strong compatibility, making riding more possible. 3. Adopt a hollow design. While reducing weight, it can also increase speed. 4. Easy to install without any adjustment, stable gear and accurate positioning are provided within the range. 5. Excellent accessory for mountain bikes and road bikes. It's a favorite of cyclists. Specification: Item Type: Bike Freewheel Material: Chromium-molybdenum steel Color: As Pictures Shown Weight: Approx. 385g/13.6oz Specifications: 10 speed 11-32T Small teeth: 11 T Teeth: 11-13-15--17-19-21-23-25-28-32T Big Teeth: 32T Wide tooth ratio mountain flywheel, large tooth ratio flywheel, for single tooth disc. It's easier to climb a hill Package List: 1 x Bike Freewheel