Novelty Lights, Inc. Bubble-Set-7 Tradtional Bubble Light and Stringer Set, 4 Orange/3 Red Bubble Fluids, Green Wire, C7/E12 Candelabra Base, 7 Pack 7 Light Set with Red and Orange Colored Lights 7' long with 12" spacing between lights and you can connect 5 sets end to end for 35' on each plug. If one bulb goes out the rest stay lit and if you need replacement bubble lights we sell a 3 pack as replacements too. UL listed for use on any live or artificial Christmas tree. Each socket comes with a clip for easy attachment on Christmas tree branches.