Voopoo Maat Sub Ohm Tank comes with 28mm diameter and 4ml capacity. Voopoo Maat Tank is the first patented Maat Sub-Ohm tank in vape market. Voopoo Maat utilizes middle adjustable airflow design with bottom airflow make-up to provide vapers smooth and cloud flavors. And Maat adopts top filling and semi-faded e-juice storage design to prevent coils burnt-out. Maat Tank features PNP design, easy to reload. And it supports DTL vaping. The others will update soon.