Air Lift LoadLifter 5000 Ultimate Plus Upgrade Kit is a high performance upgrade kit that provides significantly improved ride quality. The kit includes air springs, internal jounce bumper, air lines, roll plates and air spring hardware. The air springs feature up to 5000 lbs. load-leveling capacity for better safety and convenience when hauling huge loads. The internal jounce bumper is specially designed to absorb shock, even with zero air pressure. This ensures three-stage ride comfort, even when driving on harsh roads. The air lines are built from stainless steel for enhanced durability. If you're looking for adjustable, reliable air spring kit, Air Lift LoadLifter 5000 Ultimate Plus Upgrade Kit is definitely great choice!