Auguse Era Pro RTA comes with 22mm diameter and 4ml capacity with top filling design. Auguse Era Pro features bottom airflow and side airflow. Side airflow can be closed by holeless AFC pin. There are 4 sets AFC pin(2*0.8mm,2*1.0mm,2*1.2mm,2*holeless) inside. The bottom airflow has 3pcs*1.0mm airflow pin inside, AFC ring has 7 level airflows: 1.6mm*3.6mm,1.8mm,1.6mm,1.4mm,1.2mm,1.0mm,0.8mm. Era Pro RTA adopts dual coil deck and knurling design and can open / close e-juice channel by turning the tank.