The bong simply pushes into the mask. When worn, the mask creates an airtight seal around your face, so as you inhale the mask fills up with smoke for the ultimate hit. For use with tobacco or one of these herbal blends. The bong can be filled with water or can be used without. Either way there is also a carb hole at the back of the bong in order to increase the intensity of the hit. Bong available in 5 different colors.