SPT-1 & SPT2 Wire. 500ft & 100ft lengths of wire. Use with zip plugs. Use spt wire to create your own custom cords for holiday and event lighting. Make custom Sockets strands by adding our sockets and zip plugs. Be sure to match the SPT type to the gauge you are working with if using spt1 sockets or zip plugs be sure to use SPT-1 wire. SPT2 wire has the same 18 ga wire inside but the plastic shielding is thinker so you need the SPT2 Sockets or zip plugs to accomodate the thicker shielding.