The Sub-Vers TF is a powerful sub-ohm tank that can conveniently be filled from the top, preventing messes and making on-the-go filling easier than ever. The tank uses replaceable sub-ohm atomizers built at 0.5ohms that are wicked with pure organic Japanese cotton. And hardware is comprised of stainless steel and a glass tank capable of holding an impressive 3.5ml of liquid. The Sub-Vers TF has an adjustable airflow design. Using the rings located at the bottom of the tank, users can adjust the amount of air moving through their device to create bigger clouds and better taste.