The Athos tank is a heavy hitter for those who prefer dense clouds and top-notch flavor. It takes in three different kind of coils: The A1 Coil, is a single parallel coil head and are rated at 0.16ohm with a recommended power setting of 85-100W, this coil produces both tremendous vapor and flavor production. The A3 Coils, is a Tri-coil head and they are rated at 0.30ohm and the recommended power setting is 60-75W. The A5 Coil, is a Penta-coil head and are rated at 0.16ohm with a recommended power setting of 100-120W, this coil is for those who are wanting a higher vapor production. To truly experience the Athos tank, the airflow is designed to be at the bottom to compliment the power the tank produces.