|Innovative Airflow Control System (BAF + Top Angled Airflow) Choose Bottom airflow only for best flavor Choose Top Angled Airflow for no noise and no condensation vaping Choose both for maximum vapor production Domical top chamber for better flavor Short shaft section to increase flavor: Two 3mm airflow channels that run from the top cap down through the top of the domical chamber to boost airflow and flavor. Interchangeable Decks: Deck 1, Deck 2 Deck 3 and Deck 4 Includes a juice expansion tube to increase liquid capacity.