Our 500' Spool of Black Wire SPT-1 Extension Wire (Zip Cord) is ideal for making your own extension cords. Use our spools of black SPT-1 male and female plugs along with our extension wire to customize your C9 orC7 stringers. You can use the extension wire to add jumper wires on your roof lines or add a custom length of extension wire. The SPT-1 wire is rated at 8 Amps or 960 Watts. 500' Black Extension Wire SPT-1 Zip Cord 18 Gauge/2 Conductor Use to Add Extension Lead or Jumper Wire 8 Amps/960 Watts Indoor and Outdoor Use