Bring back childhood memories when you make these multi-color bubble lights the center of your Christmas lights. The self-contained candelabra base houses a 5-watt incandescent bulb creating both heat and light 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. These decorative bulbs come 3 to a pack and must be used only in an upright position. UL listed for indoor/outdoor use. Make these decorative bulbs a part of your holiday lighting.