This is a single AVP Pro replacement pod cartridge with a 0.65ohm mesh coil pre-installed. Each pod can hold 4ml of your favourite eliquid, for first-time use just fill and wait 5 minutes to allow the cotton to saturate before vaping. AVP Pro cartirdges use a pull-and-push coil replacement system. Pull the coil out from the bottom of the pod, then replace it with a fresh unit. You can change the coil even when there is e-liquid inside the pod. Included is a tool to assist you in the coil replacement process. It’s very simple and it is designed to prevent users from hurting their hands while changing coils.