Firestone air springs improve the load carrying performance on pickups, SUVs and vans with Leaf Spring suspension. It's innovative reinforced double convoluted air springs install between the frame and axle. Supports up to 5,000 lb. per set*. Includes brackets, air springs, hardware and insulation valve for manual inflation. Easy installation and 2 year/24,000 mile limited warranty. *Do not exceed the vehicleâ€™s recommended Gross Vehicle Weight Rating (GVWR).