It is compatible with Artery pal II Pod Kit
How to replace a coil: first to pull out the back cover, second to press the drip tip down and take out the pod; third to unscrew the airflow ring, and take out the coil; finally to screw a new coil into the base and replace the base into the pod.

Specifications of Artery Pal II Replacement Coil:
1.2ohm MTL Coil 7-12W, Best with 50-70VG e-juice
0.6ohm Mesh Coil 15-23W, Best with 70VG e-juice

Packing list of Artery Pal II Replacement Coil:
5pcs per pack