OBT Could Supply contitech air spring, firestone air bellow, rubber spring, air suspension bellows, firestone air spring, air bag, goodyear air spring, goodyear air bellow, air bellow. OBT air spring feature: 1.Reduces cab, truck body, and trailer damage 2.Reduces need for electrical and other repairs and maintenance 3.Reduces wear and tear on tires, axles, and transmissions 4.Reduces vehicle and fleet downtime 5.Extends life of truck and trailer 6.Protects hinges, lights, rivets, and trailer hardware As the leading manufacturer of truck air springs in China, you can get various model air springs from us. Air bellow, Rolling Lobe, Convoluted, Sleeve type all available.