From the makers of the Alliance V1 & V2, 28.5mm BigBoys, and the enormous 46mm FatBoy, Vapergate brings you the Gemini Series Mason RDAs. The only difference in the Geminis and the original Mason RDAs are that the Geminis are a 2 post design. The original masons are a 3 and 4 post design. The two post, velocity style deck of the Geminis are currently available in 24mm and 30mm sizes, in both a black pewter and a stainless steel finishes. The concept behind the Mason series is simple: get back to basics. There are no clever air hole patterns. No vortex or swirling air flow. No bottom or top airflow. The mason offers dual tiered, focus directed airflow straight to the coil with a continuously variable triple tiered air flow control ring. The delrin insert in the top cap is now threaded for added convenience, allowing the user to replace and remove the insert for replacement or chuff upgrades. The extended 510 connection keeps this rda safe on any mod, even if it's a hybrid. The unique heat sink built into the top cap also echoes the brick mason theme, as does the overall packaging of this rda.