Attributes . Thermostat Wire, Solid, 6 Conductors, #18 AWG Conductor Size, 150 V, 250 ft Overall Length, 0.186 in Outside Diameter, 0.006 in Insulation Thickness, Copper Conductor Material, Polypropylene Insulation Material, Red;White;Green;Blue;Yellow;Brown, -20 °C Operating Temperature, +60 °C Operating Temperature, 37 lb/mft . Names