Compression Spring 1.Dia:0.1-5mm 2.material: various of steels 3.OEM offered 4.high ... made of carbon steel,stainless steel, manganese steel wire, nickel wire, galvanized wire,alloys,etc 2.OEM: all parts can be designed and maunfactured ... dia0.1 to 5mmMaterialCarbon steel, stainless steel, manganese steel wire, nickel wire, galvanized wire,alloys,etc Surface Treatment Zinc,Nickel,Silver,Golden,Tin ...