SumoSprings Air Helper Spring Sold As A Pair [Left And Right]. Maintenance-Free. Enhances Load Carrying Ability. 1400 Lb Capacity At 50% Compression. Reduces And Stabilizes Sway. Improves Overall Driver Control And Ride Comfort. Compress Up To 80 Pct Original Height With Full Memory Rebound. Two Pieces Attached On Top/Bottom Allows For Unlimited Travel. Progressive Spring Rate. Made From Proprietary And Patented Microcellular Urethane. Will Not Leak Or Rupture. Never Load Any Vehicle Beyond The Manufacturers GVWR.