The Uwell Caliburn G3 refillable pods are designed for use with the Uwell Caliburn G3 and G3 PRO pod kits. Holding old up to 2ml of e-liquid and compatible with all 50/50 liquids and nic salts. The pods contain a built-in coil and are designed for MTL (Mouth To Lung) and RDTL (Restricted Direct To Lung) vaping.