Build your own cord to your desired specifications with this special zipcord. This standard insulated, two conductor cord has a rib on one conductor for polarity indication. Made of 18 gauge copper wire and PVC insulation material. Please note that this spool is the wiring only. Plugs and sockets sold separately. UL listed for indoor and outdoor use, and CSA approved. Additional specifications: 18 AWG SPT-1 Stranding: 41 strands/ 34 gauge. Temperature Range: 105 degrees.