air spring
Made mostly of an elastic membrane filled with air, its purpose is to provide shock absorption and consistent load stability by varying the level of air pressure. Features of the air spring include its variable stiffness for adjustable performance tuning, as well as self-leveling to ensure a smooth ride despite load conditions. Air springs have been proliferated in vehicle suspension systems to a large extent for a few years now, mainly due their better ride quality over traditional steel springs. They are just as well suited for industrial purposes, where their adjustability and sturdiness is appreciated in e.g. lifting and load handling equipment.