The Uwell Caliburn A2 replacement pods are designed specifically for the Caliburn A2 and the AK2 devices. These pods are not interchangeable with the Caliburn and Caliburn G units. These pods offer a sleek and open window design allowing vision of your juice level at any time. Coil options include the top fill or side fill. Top fill pods are the original pod design with a .9ohm coil. The side fill pods are a 1.2 ohm resistance and are a more transparent design.