... spring steel,music wire steel,and stainless steel,iron,plated steel,alloy steel,bronze,red bronze,phosphor copper,and ... beryllium copper;etcsurface treament black oxide,Zinc/Nicke/Chrome plating,power coating,oiled to prevent rust,passivate,etc. ... on or as your request2).Finish: Nickel-plated, chrome-plated, silver-plated, gold-plated, imitation gold-plated and so on or as your requestAbout the ...