Southwire 250 ft. 18/5 Solid Copper Thermostat Wire (Pack of 250)The Southwire 500 feet Brown 18 5 Thermostat and Bell Cable is designed for use in heating and air conditioning controls as well as in alarm systems. This cable offers a flat design. The insulation is made of 6 mils of polypropylene and a brown PVC jacket. UPC: 032886855337 Manufacturer Part No: 64169644 Wire Length: 250 ft. Brand Name: Southwire Gauge Conductors: 18 5 Stranded or Solid: Solid Cable or Wire Type: Copper Sunlight UV Resistant: Yes