The Mason V2 is currently available in 24mm, 30mm sizes, in both a black pewter and stainless steel finishes and addes TWO POST RAPTOR STYLE. 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. Staying true to the uni-post deck design, the negative posts are dug out leaving even more space for coils and cotton configurations. Square center post in a square hole in a square peek insulator in a square deck hole ensures no spinning... ever. 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.