UWELL Valyrian Sub Ohm Tank presents Retro style with classic type package. Measuring a 25mm diameter chassis with a 5/8 milliliter max capacity(8ml glass should be purchased separately). The filp-to-fill top refilling system makes it easy to use and clean. Also comes with three types of pin compatible for different airflow and flavor. The adjustable bottom airflow makes for smooth as well as effective airflow, provides you a better flavor.