Let this Christmas light set of multi-color bubble lights bring back joyful childhood memories. The 7 ribbed globe shaped candelabra base bulbs are spaced 12 inches apart on 7 feet of green wire. Their warm light is created by the incandescent bulb, which also generates the heat to bubble the liquid within the tube. A light tap will get any slow starters going. For over 70 years, this novel invention has graced Christmas trees, garlands, and centerpieces. UL listed for indoor/outdoor use, eight sets can be safely connected with the male to female connections.