... iron.alumininm,copper alloy 2.Metal electronic components Shell; power-supply filter shell1material:stainless steel,copper,iron.alumininm,copper alloy2 ... Welding,Plating,etc. Surface Treatment:polishing,electroplate,electroless plating,electrolytic,passivation,etc.Plating Type:Nickel Plating,Tin Plating,Zinc ... Certification:ROHS Compliant passed SGS testing elecronic component power-supply filter shell