The benign type is seen in benign lesions such as benign tumors and following trauma. An aggressive type is seen in malignant tumors, but also in benign lesions with aggressive behavior, such as infections and eosinophilic granuloma.
When setting up a Hookah air system, you will frequently need an array of metal fittings. For use around water, you should use stainless steel or brass fittings only. This is especially important when diving in salt water. Fittings made of ferrous metal will rust or corrode when used in, or near a water environment.
Bowl (or âHeadâ). A hookah âbowlâ or âheadâ is what holds your shisha and sits at the very top of the hookah. Bowls are normally made from ceramic or clay, however you can find hookah bowls made from a wide variety of materials, such as pyrex, marble, wood, and metal.