This is a 2 pack of 2mL replacement cartridges for the Mi-Pod.
Included with each pod is a very small piece-these are airflow adjustment plugs. Once piece will be underneath each pod in the rubber cover. The Mi-pod is designed to be able to both mouth-to-lung and direct-lung vape. However, if you want to make the airflow in your pods more restricted for a tighter draw, then simply insert the plug into the air intake hole. Make sure the plug is inserted with the air channel facing up like an upside down U and then push it in. It may take some force to get it all the way in.