All of the lights have glass slugs. When tested all of the lamps lit up and bubbled.
Also included is a nine socket electric cord. The item "NOMA BUBBLE LIGHTS BOX 9 BISCUIT VINTAGE C6 BUBBLING XMAS TREE LITE BULB SLUGS" is in sale since Sunday, January 08, 2017.This item is in the category "Collectibles\Holiday & Seasonal\Christmas\ Vintage (Pre-1946)\Lights". The seller is "shaffeds" and is located in Cincinnati, Ohio. This item can be shipped worldwide.