... :Conventional,Parabolic,Z-type,Galvanized,Boat Trailer, Small Trailer,Multi;3)Size: Small size & Big size are available4)Thickness:From 6mm ... to 50mm 5)Certificate:ISO9001/2000 /TS16949 control system.TINMY Leaf ... springs for all kind of trucks, trailers, buses, cars, 4wd, and light ...