The Aspire Nautilus is the next generation of tank systems. Made of stainless steel and glass, the Nautilus also uses the all new Aspire BVC (bottom vertical coil / ceramic wick) atomizer technology. The Nautilus has an exclusive adjustable airflow design that is revolutionary. With a simple turn of the lower ring, you can adjust the airflow to your preference. The Aspire Nautilus holds about 5mL of eliquid.