duty 3 wire extension cords with triple outlet female . Made with durable abrasion and flame retardant SJTW outer jacket suitable for indoor and outdoor use. These cords are UL listed and made with stranded copper wire for flexibility. One-piece molded plugs with built in strain relief to prevent cord/plug separation. Indicator lights molded into both male and female to show the cord is live. Built for use and long life, these are the power cords of choice when quality and performance matter the most.