Check out the Geek Vape ZEUS MAX Sub-Ohm Tank, featuring a 4mL capacity, dual slotted top airflow control ring, and uses the new Geek Vape M Coil Series. Constructed from durable stainless steel, the Zeus MAX Sub-Ohm Tank offers a 4mL refillable tank capacity, facilitating refills via quarter turn top fill system. Revealing two fill ports, the spare fill port prevents positive pressure from building within the tank during refills. Adopting a top airflow control ring, the dual slotted nature allows for complete control over the amount of air rushing through the center of the coil.