Serpentine Belt Multiple Accessory This is the “cogged” version of the revolutionary multi-ribbed belt first developed by Dayco for the 1979 Ford Mustang. The multiple-rib design provides better belt-to-pulley contact for less slippage, so it lasts longer than conventional V-belts. “Multiple ribs” also eliminates the need for “matching”, and allows “controlled slippage” in shock overload situations, such as when the AC compressor kicks in. Dayco's superior manufacturing technology uses a rubber-impregnated fabric backing that maximizes load-carrying capability and minimizes the noise that is often associated with the competition's rubber-backed belts. Poly Cog belts meet or exceed SAE J1459 and J1596 specifications. * Dayco Poly Cog belt part numbers identify the size and length of the belt. Here is an example; 5060560 5 = Dayco Poly Cog Belt 06 = Number of Ribs 1045 = 104.5 Effective Length