|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.