Features: Durable Material: This chain tensioner is-made of hard rubber and iron, which is-durable. Practical Accessories: This chain tensioner is-suitable for off-road vehicles and motorcycles, it-is a practical accessory for outdoor riding. Hard plastic-, very strong and durable. It fits most dirt bike, pit bike . Easy to install. Specifications: Material:Plastic+Metal Diameter:Approx.3.7cm/1.45inch Color:Red/Blue/Green/Yellow/Orange/Black Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1x Pulley Wheel Guide