... ROHS 3)Metal:Copper/Iron/Aluminium E39 porcelain lampholder,lamp holder,porcelain lamp socket,ceramic lampbase 1.B22,E10,E12,E14, ... E26,E27,E39, E40 lampholder,porcelain knife switch, ... B22,E27, E40 Series etc. Body MaterialPorcelain/ ceramic Metal MaterialScrew shellaluminium/iron/copper/brassCenter connectCopperWire connectCopper/ ...