SMOK RPM 4 Pod is a set of transparent cartridges made of PCTG, used for maintenance of SMOK RPM 4 Kit. There are two types of pods: one for RPM 4 RPM Pod using RPM coil, and the other for RPM 4 LP2 Pod using new LP2 coil with leak-proof structure. Both pods have a capacity of 5ml, enough large capacity, which can provide a continuous atomization experience and avoid the frequency of repeated filling e-juice. To fill the pod with e-liquid you first remove the pod from the battery part of the device, then: Lift open the rubber plug in the side of the pod; Fill with the desired e-liquid; Close the rubber plug, and re-fit into the device. In addition, the RPM 4 cartridge features an ergonomic mouthpiece with a duck-billed style, allowing for more airflow and inhalation. And it also has a visible window to show the consumption and remaining volume of the e-liquid. The bottom of the RPM 4 Pod includes 4 nice magnets so the pod clicks in with some force into the device. Facilitate the assembly and disassembly of the pod. Both RPM 4 LP2 Pod and RPM 4 RPM Pod support infinitely variable airflow. However, both of them do not include coils, and you need to buy coils separately. 3pcs in each pack.