This set contains 1 box of 100CT red light on green wire. Each light strand is 37' long, including a 18" lead cord, 4.25" spacing and a 3.5" end cord. If one bulb goes out, the others will stay lit on this set. Replacement bulbs and fuses included. This light set also features Socket Lock lamp holders, keeping bulbs properly connected. Each string has an end to end connector for adding on light sets for any sized decorating project. UL listed, Suitable for either indoor or outdoor use.