Compression Spring 1.Dia:0.1-10mm 2.material: various of steels 3. ... contact compression spring for electronic toys specification1.made of carbon steel,stainless steel, manganese steel wire, nickel wire, galvanized wire,alloys,etc 2 ... stainless steel, manganese steel wire, nickel wire, galvanized wire,alloys,etc Surface Treatment Zinc,Nickel,Silver,Golden,Tin-plated,Powder coating Usage Generally used ...