Material: The Bike Chainring Chain Guard is made of material Plastic. PROTECTIVE: The chain guard cover can protect your bicycle chain from dust, waterproof, stone etc. and also you do not need to worry about spilling oil on your pants when you are riding. EASY TO INSTALL: The chain guard cover is really easy to install, no any complicated process needed, convenient to install and detach.The chain guard cover is extremely lightweight, which makes it easy to carry, it will not affect your riding. SIMPLE DESIGN: This crank ring protector made of plastic, which is lightweight with simple and classic design. Note: Before you order it, Please Count the teeth of your bicycle crankset ,Count the crankset holes , and measure the diameter of the adjacent holes.Please make sure if the dimensions of your crank set is applicable to this cover. Specification: Siutable:32-38T Size Chart: 48cmx18cm/18.90inchx7.09inch Package Includes: As described Note: Please allow slightly errors due to manual measurement and different monitors. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store