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This Mathematix bubbler is far from being your standard hammer bubbler. It changes color! You may think this piece is red and blue, but wait until you use it. It will change color before your eyes. Better yet, there is a fixed downstem perc for filtration so your inhale will be much more comfortable. This hammer bubbler features a side carb, as well as three marbles to enhance the grip. You can also easily set it down on any flat surface, and it will stand on its own. Mathematix has taken care of every detail a bubbler can offer.