With the option to switch from pre made coils to your very own built coils, the Subtank Mini will be sure to allow you to push plumes of vapor with whatever route you decide to choose. Made of stainless steel and Pyrex, not only do you get premium quality materials, but you also have 4.5mL of capacity at your full disposal. The airflow on this device, which is located at the base of the tank, provides different options depending on your vaping mood.