... black, engraving fonts 3,ROHS products Product nameMobile phone metal partsMaterials Available1. Stainless Steel: SS201, SS303, SS304, ... , natural anodization, heat treatment, polishing, nickel plating, chrome plating, yellow passivation, gold passivation, galvanizing, satin, etc ... price .Mainly processing and manufacturing various kinds of metal parts and screw, nut, rivet of national standard ...