It features 25mm diameter and the innovative leak-proof top airflow system, the airflow transferring from the top to the bottom to maintain great flavor. Made of stainless steel, Zeus X RTA is durable and easy to clean. It comes with dual coils build deck which is easy to operate, combined with the Geekvape coils, it will bring a very excellent vaping experience! Together with the large 4.5ml juice capacity, it supports top refilled and compatible with both 810 and 510 drip tips. 6 colors are available.