SMOK RPM40 Replacement Pod are compatible with the RPM40 Series coils and Nord Series coils! They can be well known by the rubber plugs. 1x Plug being black and 1x plug being red. And the corresponding text that states 'RPM' or 'Nord' on the plugs themselves. The SMOK RPM40 pods offer a huge eJuice volume of 4.3ml! The square housing for the pods is expertly crafted and has stood up to SMOKs rigorous testing methods to ensure absolute perfection. Transformation Keeps changing the vaping experience.SMOK RPM40 Replacement Pod Cartridge Vaporizer can take your vaping session to whole new heights with its simple operation. Add this vaporizer to your shopping kit at affordable prices.