These beautiful blown glass novelties have been around for centuries. When the lower bulb is held in the hand the liquid rises into the upper bulb and then bubbles away as if it were boiling. A fun novelty and an attractive ornament.
 
One provided. These come in four shape variations, each with a different coloured liquid within.
 
Manufacturer's safety information: This item is not a toy, keep away from young children. Please read safety warning on packaging.