The RPM 2 Replacement Pods By Smok without Coils are made of healthy PCTG material. There are 2 types of Pods available, the RPM 2 Pod and RPM Pod, the RPM 2 Pod compatible with RPM 2 Mesh Coils only, which will bring you the dense vapor and intense flavor, you can use for the DL vaping. the RPM Pod compatible with RPM Series Coils and recommend the RPM Mesh Coil 0.4ohm for the gentle throat hit and satisfying flavor, you could use for the MTL vaping. Both of them can hold 2ml e-juice, with convenient side e-juice refill design, the RPM 2 Pod with the large and ergonomic mouthpiece with an oval-shaped aperture of 9.5x5.6mm, allowing for more airflow and inhalation. The Smok Pods have a transparent area for better viewing of your e-liquid consumption, you will know how much juice left by one glance.