3.5mm 4 pole dc audio plug 1.Materials: copper rod (59%), POM plastic (POM-450 ... .2mm,nickel plated white plastic,3.5mm 4 pole dc audio plug Product advantages: 1.Materials: copper rod (59%), POM plastic ... Din, USB sockets, MiNi female mould, power-supply connecting plugs, audio plugs, video plugs, transferring plugs, switching plugs, variety of plugs, sockets ...