Southwire Type SOOW Flexible Cords are designed for extra hard usage on industrial equipment, heavy tools, battery chargers, portable lights welding leads, marine dockside power, power extensions and mining applications. Specifications: OSHA acceptable MSHA listed. Passes MSHA Flame Test(P-136-29) Sunlight, oil, acid, water and weather resistant. Construction: Southwire's Type SOOW Flexible Cords are manufactured using bare flexible rope-stranded stranded annealed copper conductors, with a heat, moisture and oil resistant EPDM rubber insulation per UL-62. The insulated conductors are cabled with paper fillers. A tissue-paper separator is wrapped around the assembly to promote easy removal of the jacket. A heat, moisture and oil resistant flexible CPE jacket is extruded over the assembly to complete the construction.