SMOK RPM Replacement Pod is designed for SMOKTECH's Fetch Pro Pod System. These pods fit sleek and flush when installed on the Fetch Pro. The pods come with a removable 510 drip tip and an airflow control ring. There are 2 variations of the pod the 4.3mL RPM Version and the 4mL RGC Version both providing great performance as expected with SMOK products. It's filled via the fill port located on the back of the pod. Simply remove the silicone e-liquid stopper to access the fill port. Each pack comes with 3 replacement pods for the SMOK Fetch Pro Pod System.