Sold as a pair left and right,Never Load Any Vehicle Beyond The Manufacturers GVWR,Improves Overall Driver Control And Ride Comfort,Compress Up To 80 Pct Original Height With Full Memory Rebound,Progressive Spring Rate,Requires no maintenance; Proudly made in the U.S.A.,Enhances Load Carrying Ability,Made From Proprietary And Patented Microcellular Urethane,Reduces And Stabilizes Sway,2500 Pounds Capacity At 50 Percent Compression,Worlds Only Leak Proof Air Spring,1 Pc. Attached On Top/Bottom Will Stretch 50 Pct Of Body Height