1.Type: Conventional, Parabolic, Z-type, Multi... 2.High quality, Competitive price, Fast delivery 1)Marerial: SUP6,7,9,9A,10,11,11A;2)Type: Conventional, Parabolic, Z-type, Galvanized, Boat Trailer, Small Trailer, Multi, Single;3)Size: Small size & Big size are available4)Thickness: From 6mm to 50mm 5)Certificate: ISO9001/2000, TS16949 TINMY Leaf springs for all kind of trucks, trailers, buses, ...