This scarce box of bubbling Christmas lights by Silvestri is from the 1970s, maybe early 1980s. They're more petite than the original 1950s bubble lights, 3 inches high with slender glass tubes and solid colored plastic ball bases with branch clips. There are ten lights on the string, placed about 9 inches apart. I estimate the total string length to be between 10 and 11 feet. The lights all work fine as shown and they do bubble - I just didn't wait long enough before snapping the last picture.