Feature:1. Applicable Model: Pulley chain tensioner rollers are specially designed for 49cc 66cc 80cc Engine Motorized Bicycle Bike.2. Function: Pulley tensioner roller can reduce the pressure on the chain, maintain consistent pressure and maximize performance.3. High Strength: Made of ABS+metal alloy with high strength, high hardness, and is not easy to deform or crack to ensure long term use.4. Direct Replacement: Pulley tensioner roller can be installed without modification, convenient and fast, and damaged original parts can be replaced.5. 4pcs Tensioner Rollers: The package include 4pcs pulley chain tensioner rollers, sufficient quantity to meet your requirements.Specification:Item Type: Pulley Chain Tensioner RollersMaterial: ABS + Metal AlloyQuantity: 4pcsApplicable Model: 49cc 66cc 80cc Motorized Bicycle Bike.Package List:4 x Pulley Chain Tensioner Rollers