Highly flexible annealed 30 gauge bare copper conductors, insulated with a vinyl SJTW jacket. Operating temperatures range from -37° C to +91° C (-35° F to +195° F). Stocked in blue, red, and yellow jacket colors. Designed for indoor and outdoor heavy industrial use. These cords are flexible, durable, and manufactured in the USA, to meet or exceed all UL and OSHA requirements.