For testing electrical circuits without the mess of loose wires. Retractable test leads pull out and stay at desired length. Rewind test leads when not in use. 18-gauge copper wire. Different colored wires for easy identification Set includes: (1) 2 x 15' retractable test leads with banana plugs, 1 pair of test probes, 1 pair of alligator clips and 1 pair of spring hooks.