SMOK Nord 4 replacement pods are compatible with the Nord 4 open pod vape kit. Each child resistant certified (CRC) pod has capacity for 4.5mL of e-liquid with a side fill port and secured silicone plug, and four corner magnets that securely hold the pod to the device. Choose between the Nord 4 RPM pods which are compatible with the original RPM series of coils or the Nord 4 RPM 2 pods which are compatible with the larger RPM 2 series of coils