Thermostat Wire, Solid, 8 Conductors, #18 AWG Conductor Size, 300 V rms, 250 ft Overall Length, 0.21 in Outside Diameter, 0.006 in Insulation Thickness, Copper Conductor Material, Polypropylene Insulation Material, Brown, -20 °C Operating Temperature, +75 °C Operating Temperature, 50 lb/mft