Vandy Vape Maze BF RDA provides the incredible squonking experience without the inconvenience of rebuilding coils. The Maze BF RDA utilizes a flat horizontal SS316L 0.2ohm coil that provides flavor and vapor production. The Vandy Vape Maze BF RDA features five sets of nine mini airflow holes that helps provide an incredibly smooth vaping experience and reduce spit-back. The Maze BF RDA integrates bottom feeding squonker pin thats pre-installed and also includes a standard 510 contact pin as well. The included central refill tube must be installed when using the standard 510 contact pin.