Dayco's patented self-lubricating fabric provides exceptional resistance to abrasion resulting in extended pulley and belt life. The multiple-rib design provides better belt-to-pulley contact for less slippage so it lasts longer than conventional V-belts. The transverse groove design runs cooler (up to 50F) and dramatically reduces rib cracking thereby increasing the... More life of the belt by at least 40%. The grooved design provides flexural stress relief for increased flexibility in both normal and backside bending. Dayco's superior manufacturing technology uses a rubber backing that maximizes load-carrying capability and minimizes the noise that is often associated with the competitions belts.