The Dayco 1.10” x 64.57” Poly Rib® Heavy Duty Serpentine Belt ensures you are Ready for the Road Ahead™ being engineered for power from maximum temperature EPDM rubber and boasts a highly fiber-loaded compound to maximize belt life. This heavy duty truck serpentine belt also features a specially formulated treated cord that guarantees length and tension stability. FleetPride is your First Click in Heavy Duty®.