... metal spring wire diametervariousmaterialcarbon steel,alloy spring steel,music wire steel,and stainless steel,iron,plated steel,alloy steel,bronze,red bronze,phosphor copper,and beryllium copper;etcsurface treament ... other requirements About the material:1). Carbon Steel, Stainless Steel, Copper, Phosphor Bronze, Beryllium Bronze and so on or as your request2).Finish ...