Features: 1. Adopts full aluminum alloy heat treatment, full CNC cutting process, more lightweight. 53/56/58T available. 2. The anodizing process will generate an oxide film on the aluminum surface, which effectively protects the aluminum alloy body, prevents corrosion and rust, and is not easy to fade. 3. Lightweight and small size, easy to install and use. Upgrade your bike and bring a better experience. 4. Suitable for road bike, mountain bikes, folding bike, etc. Also suitable for modified, DIY, upgrade the bike. 5. Suggestions: 14-inch folding bikes are generally 45/47T, 16-inch folding bikes generally do not exceed 53T, and 20-inch folding bikes generally do not exceed 56T. Notice: Actual color may be slightly different from the image due to different monitor and light effect. Please allow 1-3cm deviation due to manual measurement. Description: Material: 7075 aluminum alloy Color/Style: As the picture shown Size: As the picture shown Package List: 1 x Chainwheel only