Vehicle Fitment: F-250 2011 F-350 2011 F-450 2011 F-550 2011 Motorcraft belts are exhaustively tested to help ensure Original Equipement quality and durability. Why Buy: -The only parts recommended by Ford Motor Company for Ford, Lincoln, and Mercury vehicles. -Motorcraft belts are designed for minimum maintenance and maximum performance. -Manufactured from premium-quality materials to strict Ford Engineering standards. -Polyester cords help belt resist stretching, minimize slipping and provide excellent performance in applications with short adjustment drive systems. -Multi-layer laminated construction and die-cut edge design provides quiet operation and long life. -Motorcraft cogged belts are designed to flex easily around even the smallest pulley. -The molded cog design helps preserve belt strength, eliminate rough edges and provides quiet operation. -Precise fit and belt lengths results in fast installations and can provide fewer customer complaints.