Construct your Christmas light design easily and quickly with this SPT-1 stringer. The 500 foot, green wire stringer has intermediate sockets spaced 12 inches apart for screw-in C9 bulbs. UL listed for indoor/outdoor use, the stringer has a lead length of 12 inches and a tail length of 6 inches. There are no plugs, so you determine length and plug position. Make your lighting display as unique as your home with this reliable and durable socket stringer.