Bubbler are small water pipes feature a mouthpiece, stem abd a bowl as well as a chamber which holds water for the smoke to travel through. This enables the smoke to be cooled while floating through, making it a much more smoother hit. Some types of bubbler water pipes come with a percolator, which is an extra water chamber which helps in the cooling process. Some also come with display carb holes, which allow for faster clearing of the smoke. Also bubblers come in many size shape and colors, pretty much there is a style for anyone's taste!