Producing 9 mm thickness tubing is very costly to product but it is well worth due to its gorgeous and beautiful looks. It comes with an 14/18 mm slitted diffuser downstem and a 14 mm thick bowl. From there smoke is diffused and cooled in the main chamber. A long 9 mm thick tube keeps water from bubbling up towards the thick, comfortable mouthpiece, and one hole ice catcher will hold a few cubes for even cooler smoke. This water pipe is made of quality borosilicate glass.