Designed for high mileage multiple-accessory drives, Dayco's “W  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. The "W" profile cut into the tip of each rib makes the tip more flexible and eliminates belt chirp when the belt enters a worn or misalligned pulley.  Constructed with Aramid reinforced EPDM compounds, the Dayco  “W  profile 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 J2432 specifications.  This Poly-Rib  Belt is another Dayco  product proudly made in the USA.