1、Made of high quality steel, durable and can service for a long time 2、Precise and consistent hyper glide shifting performance 3、8/9/10 speed cassette flywheel 4、Nickel plated finish for easy cleaning and smooth shifts 5、It is suitable for mountain bicycles Description: Our bike freewheel is made of high grade steel. Precise and consistent hyper glide shifting performance. Long leg spacer for further weight reduction. Enlarged sprocket window design for lighter weight. Nickel plated finish for easy cleaning and smooth shifts. It is a great accessory for your mountain bike. Features: 1. Made of high quality steel, durable and can service for a long time. 2. Precise and consistent hyper glide shifting performance. 3. 8/9/10 speed cassette flywheel. 4. Wonderful flywheel for your bicycle. 5. Nickel plated finish for easy cleaning and smooth shifts. 6. It is suitable for mountain bicycles. Specifications: Material: Steel Color: Silver (as shown in the pictures) Type: 8 speed-11T, 8 speed-12T, 9 speed-11T, 9 speed-12T, 10 speed-11T (optional) Diameter: approx. 4.5cm / 1.7" Package Weight: approx. 10g Quantity: 1pc Fit For: Suitable for mountain bike flywheel, not for road bike flywheel Package Included: 1 x flywheel teeth Note: 1. Please note that your flywheel's specification before you buy. 2. Suitable for mountain bike flywheel, not for road bike flywheel 3. Please allow 1-3mm error due to manual measurement. Thanks for your understanding. 4. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please in kind prevail.