The Uwell Caliburn G2 refillable pods are compatible with the Uwell Caliburn G2 pod kit. On the inside of the box look for the unique security code supplied, as shown in pics and check with Uwell. Designed for MTL (Mouth To Lung) vaping, when paired with the Caliburn G & G2 coils these pods create a small amount of vapour and allow for an inhale that feels like a cigarette.