The Geekvape Poseidon sub-ohm tank has a 5mL tank capacity, is compatible with all Z-coils. This tank is constructed from stainless steel and the tank design offers some glass protection to help prevent it from unfortunate breaks due to dropping on flat surfaces. Although still possible, the chassis offers a cushion of space to prevent the glass from hitting directly with things that would normally break the tank. This is a top fill tank that detaches easily with a quarter rotation to the left! The Poseidon offers a middle adjustable airflow ring with three inlets to help find the perfect airflow for preferred vaping. The flavors off the Z-coils themselves are one of the best tasting coils.