The Aspire ETS Steel Tank is a slightly heavier duty option for pen style tanks. It makes use of the ETS BVC coil so it delivers better airflow and flavour compared to most pen style tanks. This new Aspire ETS Steel Tank is now 2ml capacity so it complies with EU and UK regulations. It’s a tank that is ideally suited to mouth to lung Vapers. So that means you want it to have a tight, cigarette like draw.