... spring specification1.made of carbon steel,stainless steel, manganese steel wire, nickel wire, galvanized wire,alloys,etc 2.OEM: all parts can be designed ... dia0.1 to 5mmMaterialCarbon steel, stainless steel, manganese steel wire, nickel wire, galvanized wire,alloys,etc Surface Treatment Zinc,Nickel,Silver,Golden,Tin-plated ...