This mini glass bong measures 20cm / 7.87 inches in height and features a spacious bubble base that holds more water for better filtration. The bong works by pulling smoke through the submerged downstem, which causes the smoke to cool as it diffuses in the base before being pulled upwards. This results in a smoother cooler hit that is still full of flavor but a lot less harsh on the throat and lungs. The bong is compact and small enough to take with you and enjoy while out.