The Dayco® Poly Rib Aramid Serpentine Belt has been engineered to maintain a quiet, vibration-free belt drive system. Unlike polyester-corded belts, these aramid cords will resist elongation, especially during high accessory loading. This unique feature of length stability and minimal stretch can aid in those difficult drives where span vibrations and tensioner movements are excessive, resulting in reduced belt noise. The Dayco® Poly Rib Aramid Serpentine Belt Is built with the Dayco® specially designed EPDM rubber compounds that resist cracking and perform better under extreme temperature ranges.