The Smal Glass Bong is a one time purchase that will help you save on costs used on rolling papers. If well maintained, it will serve you for up to years. It is easy to use and will not give you any difficulty. The side bowl is used for burning dried buds while the mouthpiece is used to draw smoke from the chambers. When you light the buds on the bowl, the smoke moves into the water for filtration. You will notice bubbles as you draw in the smoke. It is also a perfect gift for your friends.