2pk Mi-Pods - Empty: 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 make the airflow in your pods more restricted for a tighter draw, then simply insert the plug into the air intake hole (see image below). Make sure the plug is inserted with the air channel facing up and then push it in. It may take some force to get it all the way in.