The Mason RDA series by Vapergate is a collection of three RDAs in differing sizes that are made to match the ultimate standards in high performance vaping. The 24mm and 30mm RDAs share similar build decks: each has a dual terminal positive post for easy breezy dual coil building, and fully adjustable dual airflow from stacked cyclops airholes on each side of the external sleeve. The 40mm Mason build deck sports a hefty quad terminal positive post, two dual terminal negative posts, and an optional quad airflow external sleeve, making quad coil builds unbelievably simple and straightforward. The positive and negative posts on the Mason RDAs are respectively keyed and milled from the deck, ensuring a spinless future in building. The negative posts also have the underside cut out for even greater space efficiency in the 6mm deep juice well. The unique heat fins on the top cap mirror the brick mason theme of this series, as well as function as auxiliary airflow throttled by the threaded Delrin drip tip adapter holding the friction fit drip tip in place.