Vickerman 7 Light Mu Light Colored Bubble Set with Green Wire 20-Inch, Spacing UL End Connector Go to amazon.com Related posts Check expert advices for bubble lights? FeatureAdds an old fashioned look to your tree!Set of 7 Bubble LightsRequires electrical source outlet Description7 Light Multicolored Bubble Set Green Wire 20" Spacing, Red, Green, Yellow UL End-Connector to connect up to 3 sets end-to-end.