Pair of professional phono plug with RCA or CINCH connection type is marked red and black. Including 2 x 2 strain reliefs for cable outside diameter 3.0 to 7.3mm. Additional strain relief for cable outside diameter up to 8.0mm available as accessory. Spring loaded ground contact has retractable element with separate wedge contacts which keeps the shell in the front position when engaged thus also providing a direct and strictly coaxial electrical connection from the socket via the shell to the cable shield. All metal design, machined brass and black coated shell. Easy assembly and soldering (large soldering area, rapid-flow plating). High grade plastic insulator with high creep resistance.