Add a female barrel jack to to your device or project. These pigtails have molded 5.5x2.1mm jacks with black PVC covering the wire. The end is pre-stripped and tinned and is ready to be soldered, connected with terminals, or connected with wire nuts. Constructed of 18AWG copper wire for optimal conductivity and superior resistance. Connectors: 5.5x2.1mm Female Barrel, bare wires Length: 3 Feet / 1 Meter Polarity: Center positive Material: 18AWG copper wire with PVC jacket