Foam or plastic rings cut from a grocery bag can be made to float above a Plastic pipe or balloon by means of static electricity repulsion. Simple materials can be used to make this fun toy that teaches a little about electrical charges. There are several alternative materials that can also be used that are not mentioned in the video but can easy be tested to perform this experiment.
The purpose of the rubber stopper and small wooden dowel on the end of the tube is for picking the rings off of the ceiling. The rings will stick to walls or the ceiling if it gets too close. This makes it much easier to get them down.