Create lighting drama when you use this SPT-1 stringer for your commercial Christmas light designs. This 1,000 foot, white wire spool has 667 intermediate sockets spaced 18 inches apart for use with C9 bulbs, making it ideal to frame exteriors and light stately Christmas trees. UL listed for indoor/outdoor use, the stringer has lead and tail lengths of 18 inches each. There are no end plugs, so you determine length and plug position. Create a one of a kind holiday lighting display with a durable, economical, and reliable light stringer.