The Grav Medium Gravitron is like the old gravity bongs you used to make in college but done right! This piece is the smaller version of the original product that made Grav as popular as it is today. It delivers massive hits every time and is super easy to clean. Just fill the base with about 8" of water and place the open-ended bottle inside. Light your herbs in the bowl and slowly pull the jar up, not letting it completely come out of the water. Simply remove the bowl and put your mouth on the top of the bottle and push down while inhaling for a huge rip!We know you will love this piece just as much as we do!