The Dayco Serpentine Light Duty Timing Belt Idler/Tensioner Pulley is designed to provide superior performance and reliability. This pulley is constructed with double high temperature seals to ensure peak bearing performance and a grooved pulley that contains specially formulated glass-filled polymers to ensure high strength. It also features lifetime lubricated ball bearings for smooth operation and long-lasting performance. FleetPride is your First Click in Heavy Duty®.