This is 18" of thick glass and supreme tree perc filtration. The base chamber is a classic beaker shape with a standard diffused down stem, which allows for smooth airflow to the secondary 12-arm diffuser perc chamber positioned above. Tree diffusers are one of the most efficient and smooth-hitting percolators. The many small slits and openings in the diffuser yield more smoke per volume of air in one inhalation. This is the benefit of maximum diffusion. It produces a steady and evenly distributed ingestion of smoke or vapor. A large water pipe like this is excellent for adding fun accessories. For example, an 14mm Tree perc diffused ash catcher or an e-nail make great additions to this fine piece. We here at The Mushroom love this Water Pipe!