I have had two strings of these bubble lights for years and I love them. . The liquid is heated up from the light which cause them to bubble. Mine are from the 50's, these are reproductions . I would of loved to find original one ( that work) but they are really hard to find. Truth be told, I am happy to even find these. We bought three boxes, there are 7 bubble lights on each string. I know I will probably end up buying more. Can't help myself.
I was also excited to find the C9 Christmas string lights.
These are also reproductions of The original 50 style of Christmas lights. They are softer then modern lights and have a light frosted look to them. If your interested in them or other 50's style lights they are at True Value. I am so looking forward to putting up my tree and hanging my new lights on it.