Frost Bubbles Glycerin

A notable design element of this specific model is a sealed section in the neck containing glycerin. Glycerin is often used in glassware because it can be placed in a freezer to reach low temperatures without freezing into a solid mass. The internal structure includes a triple bubble diffuser, and the unit typically includes a 14mm male glass slide that also contains a glycerin-filled chamber. These components are designed to be chilled to provide a cooling effect on the air or vapor passing through the chamber.