CESS 2.5mm 4-Pole Stereo TRRS Jack Socket Cables Connectors - 2.5mm 4 Pole Jack (5 Pack) 2.5mm 4-pole socket 2.5mm 4-port stereo female jack 2.5mm 4-pin cable connector Soldering type.Use for microphone jack, earphone jack, Audio Video AV PC. Gold plated for maximum signal transfer & durability.Material :Copper