SuperSprings SSC-37 SuperCoils Fits 05-16 F-450 Super Duty F-550 Super DutyCoil Spring SuperCoils; Heavy Duty Replacement Coil Spring; 5000 lbs. Coil Capacity; FEATURES: Sold as a pair left and right Requires no maintenance; Proudly made in the U. S. A. Heavy Duty Replacement Coil Spring 5000 Pounds Coil Capacity Replaces Overworked And Sagging Coil Springs Levels Sag And Increases Load Support Typical Installation Completed In Approximately 1 2 Hours Never Load Any Vehicle Beyond The Manufacturers GVWR SuperCoils(R) are