... jack: 1.6.5*3.5*20.0L,gold plated 2.ROHS REACH certificate 3.Environmental protection 4.4 pole, for headphone ... gold plated, POM black plastic, OD 6.5 mm, ID 3.5mm, 20.0L, 4 stage headphone jack, 3.5 ... dc female jack socket: 1. Materials: copper (59%), POM plastic (POM ...