31.8/34.9mm Gravel Bike Single Speed Chain Guide Road Bicycle Chain Guard AU   Color:black,red Weight: about 30g Type: Installed on Front Derailleur Packing: 1x single gear chainring Material: 7075 aluminum alloy CNC; nylon note: 1. due to manual measurement, please allow 1-3cm (0.39-1.18in) error. make sure you don't mind before bidding. 2. due to the difference of different monitors, the picture may not reflect the actual color of the product. thanks.