The Dayco Serpentine Light Duty Timing Belt Idler / Tensioner Pulley is perfect for your light duty timing belt needs. This pulley is designed to provide superior performance and reliability. It features lifetime lubricated ball bearings, double high temperature seals to ensure peak bearing performance and a grooved pulley that contains specially formulated glass-filled polymers to ensure high strength. FleetPride is your First Click in Heavy Duty®.