Features: Make from aluminum alloy and nylon with fiber, not easy to rusts, ensuring durability. With a chain mud and dust proof designs to maintain perfectly chain performances. Enhances chain efficiency by reducing wear, prolonging chain lifes and reducing noise. Suitable for mountain bike, road bike, folding bike. it can also be used as a replacements for your old or break chain. Simple to install, light in weight, and small. None more worry about the chain falling down during Cycling after installation. Specifications: Component: Aluminum Alloy and Nylon with Fiber Color: Gold/Red/01/Black Size: As Shown in the Picture Package Includes: 1pc Chain Guide note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.