The innokin i sub tanks are the cutting edge in clearomiser technology utilising its sub ohm capabilities to create unrivalled clouds of vapour and powerful flavour including two 05 ohm replacement coils with fully adjustable airflow and a capacity of 4ml it is the largest and most advanced innokin tank available in our ranger please note that this tank is only compatible with the innokin cool fire iv as this product is a sub ohm device resistance of less than 1 ohm we strongly recommend