Commercial lighting designs are quick and easy with this heavy duty, SPT-2 Christmas light stringer. The 330-foot black, 16AWG wire stringer has 264 intermediate sockets spaced 15 inches apart for screw in C9 light bulbs. 10-watt per socket maximum. For indoor/outdoor use. There are no end plugs, so you determine the length and final position of the plugs. Installation by qualified electrician recommended. Let your imagination go wild with lighting design possibilities. Bulbs not included.