SMOK Nord 4 Pod Cartridge is a replaceable empty pod for SMOK Nord 4 Pod System Kit. The pod is refillable and you can just replace the coils without discarding the entire pod. Each pod holds up to 4.5mL of your favorite freebase or nicotine salt e-liquid, and pods can easily be filled via the rubber plug on the side of each pod. There are 2 different pods and they are compatible with different coil ranges: Nord 4 RPM 2 Pod – this is compatible with the RPM 2 range of coils; Nord 4 RPM Pod – this is compatible with all RPM coils. Meaning these pods can be utilized for both MTL (Mouth To Lung) or DTL (Direct To Lung) vaping.