Levels vehicle front-to-rear and side-to-side Improves ride while loaded and stabilizes heavy loads Adjustability is between 7-100 Pascal per square inch Used on 1/2 ton pick-ups, 1/2 and 3/4 ton vans, SUV's and mini-trucks Kit includes air springs, air line, fasteners, upper and lower brackets, inflation valves, push-to-connect air fittings and detailed instructions