In the Multi-Level-Bong Ice Ufo-Perco + Frit in heavy quality, the smoke is drawn through four levels. The smoke is first filtered by a frit, a porose filter made of baked glass grains and swirled in the second chamber. In the third level, it is drawn through an ufo percolator. The fourth level is separated by a dome with diffusor slits which additionally serves as a splash guard. Here are also the ice notches on which you can place ice cubes for the final cooling. All in all this is the total multi-level-swirling. With herb bowl.