Color: black/yellow/blue/red Material: iron+plastic Size: 106*86**86mm Package list: 1 X chain tensioner Note: Wheel colors are shipped randomly Features: Material: Made from iron and plastic, which is rust proof, durable. Usage: Fits for most motorcycle, dirt bike, motocross, ATV and more Automatic adjustment: Adjust the chain automatically, no manual adjustment. Function: Prevent the chain fall for flabby, effective to improve the safety of driving, and greatly improving the inadequacy of the tire. Advantage: The product makes the chain wear resistant and prolongs the service life of chains. Safe: Designed for motorcycles, it is screw-mounted for quicker, easier and safer. Notes: 1. Please allowed 1-3mm differences due to manual measurement, thank you 2. Due to the difference between different monitors, please understand that the picture may not reflect the actual color of the item.