Another exciting new addition to the Subtank family is the Nano. With a diametre of 18.5mm, it is a perfect partner for the iPow 2 or EVOD 1600mah VV (using beauty collar). Unlike the Subtank Mini, the Nano does not offer the RBA option, only the new Organic Cotton Coil (OCC) which are a fantastic coil. Holds 3ml of juice.