Coleman Cable 553036607 Thermostat Wire, CL2 Solid Bare Copper, 18/3, 500-Foot 500-Feet spool of wire Thermostat Wire, CL2 Solid Bare Copper, AWG size: 18/3 Smooth jacket eliminates snagging and tearing Some applications: thermostats, air-conditioning controls Pvc jacket, polypropylene insulation ensures excellent strip ability