The Uwell Caliburn G2 Empty Pod Cartridge is made for the Caliburn G2 kit. It has a 2ml capacity, a top-fill design, and an adjustable airflow system. The G2 cartridge adapts to both the G and G2 series coils, depending on your preference. Depending on your choice of coil, the G2 replacement pods are good for both Mouth-to-lung and Direct-lung.