Southwire Type SJTW Flexible Cords are manufactured using sizes 18 AWG though 10 AWG bare flexible stranded Class K copper conductors per ASTM B-174, and heat, moisture and oil resistant 105°C color-coded PVC insulation. The insulated conductors are cabled with non-wicking polypropylene fillers, with a tissue-paper separator wrapped around the assembly to promote easier removal of the jacket. A heat, moisture and oil resistant flexible PVC jacket is extruded over the assembly to complete the construction.