Description: *1. Material: aluminum alloy *2. Colors: black, red, blue, green, purple, gold, rose, orange (as shown) *3. Diameter: 25.8mm? *4. Weight: about 6g Features: *1. Made of high-quality aluminum alloy, light weight, strong and durable. *2. Adopt CNC machining and anodic oxidation process, the surface is bright and not easy to fade. *3. Pair with 2 waterproof rubber rings(22-25mm), which can suit for most integrated hollow chainwheels.? *4. Weight only 6g, suitable for most mountain bike, road bike, etc.? Package Includes: 1x Tooth Disk Dust Cover? 2x O-ring Note: *1. All pictures are professionally color-coded, but due to the difference of ambient light and display equipment settings, there may be some deviation between the pictures you see and the objects themselves, please understand. *2. The data is measured manually, and there may be some deviation, but it does not affect the use.