Leaf spring 1)Material:SUP7-11A 2)Size:Small & Big size 3)Type:Type:Conventional,Parabolic, Z-type,Galvanized Leaf spring1)Marerial:SUP7,SUP9,SUP9A ... control system.TINMY Leaf springs for all kind of trucks, trailers, buses, cars, 4wd, and light commercial vehicles... 55-930 /55-120 Leaf spring