Bare stranded copper conductor insulated with EDPM and jacketed with EDPM conforming to UL and CSA.UL 62 Flexible Cord; CSA Standard 22.2 No. 49; MSHA Approved; RoHS Compliant. Durable Jacket Resistant to oil, ozone, weather, sunlight and water. Heavy Duty Flexible Cord for indoor and outdoor use including industrial machinery appliances, heavy-duty tools, motors, and temporary indoor and outdoor electrical power and lighting.