Compress Up To 80 Pct. Of Original Height w/Full Memory Rebound,Sold as a pair left and right,Reduces And Absorbs Vibration,Never Load Any Vehicle Beyond The Manufacturers GVWR,Improves Overall Driver Control And Ride Comfort,Increases safety,Progressive Spring Rate,Requires no maintenance; Proudly made in the U.S.A.,Made From Patented Microcellular Urethane,Reduces overall cost of ownership,Worlds Only Leakproof Air Spring,500 lbs. Capacity at 50 Percent Compression