The Kanger Subtank Mini is another revolutionary tank from Kangertech. Allowing the user to get the performance of a subohm tank with the convenience of a large 4.5ml capacity tank. The subtank uses the new sub-ohm OCC (Organic Cotton Coil) Coils. The OCC are made with Japanese cotton and have a unique square shape. They are said to have a longer life span a larger heating section, and most importantly a purer taste. The tank comes fully equipped with an adjustable airflow option, and a sturdy glass tank for a sleek and stylish design. You have the option to use the pre installed OCC coil or the Kanger RBA coil head if you prefer building your own custom coils. If you want a tank that has incredible vapor production and you are seeking to overall enhance your vaping experience, this is definitely a worthy purchase.