The Dayco Poly Rib belt is 81" long and 1.09" wide with eight ribs. profile belt (patent pending) is the most innovative advancement in multi-rib belt design in over 25 years. Developed through extensive laboratory and actual road mileage testing, this unique rib profile has been specifically Dayco engineered to conform to high mileage, worn or misaligned drives without a sacrifice in quiet, long-lasting performance. Constructed with Aramid reinforced EPDM compounds, the Dayco “W” profile serpentine belt delivers more than OE required quality...it delivers the solution to troublesome drive problems. Dayco Poly-Rib Belts meet or exceed SAE J1459 and SAE J1596 specifications.