The Apocalypse 25 is the best of the best from the OG apocalypse with a slight upgrade!! 25MM!!! The 7mm Build Clamps with recessed screws allow you to fit any size coils you desire! 4mm juice well with 5mm Single or dual airflow holes gives you the ability to chase flavor or massive clouds!! Vape Life bro!! The NEW AND IMPROVED Apocalypse 25!