Set of 3 Bubble lights Replacement bulbs. For use in any indoor standard C-7 Christmas set. Fits C7 (Candelabra base) Indoor/Outdoor Use 120V 60Hz AC. Continuous bubbling when lighted. Cooler Burning Low energy lamps. Replacements for item UL1002 or UL1304. Bubble Novelty Lights and more by Kurt S. Adler, Inc.