The MOB Funnel Hookah Bowl is ingeniously designed for increased air flow through your hookah, this bowl gives your hookah airflow the ability to easily travel in a straight line from the bowl down to the base with optimal air flow. Due to its thickness this 100% clay bowl is one of the most durable in the market. The center spire is where the name 'rook' is truly derived, as this area looks like a castle, which is a layman's term for a rook. The castle area serves a distinct function. When your hookah foil is laid on top, the lowered ends of the castle remain open so your airflow cannot be cut off, unlike other funnel style bowls.