This is 14" of thick glass and supreme filtration. The base chamber has a matrix donut diffuser which creates maximum airflow to the secondary matrix diffuser above. Matrix 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. The 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 18mm 90° matrix diffused ash catcher or an e-nail make great additions to this fine piece. We here at The Mushroom love this Water Pipe!