This massive Glass Bong by Grace Glass is 20 inches tall and a true heavy hitter that will keep the most seasoned bong ripper in the couch for a good amount of time. It doesn't only hit hard the quality of the smoke is also outstanding and a big part of the reason to that is the 6-Arm revolver-style diffuser at the bottom of the large (29.2mm) downsteam. After the smoke has been broken up in the diffuser it has to pass the 11 arm tree percolator to get filtrated one more time before it gets cooled down by the ice in the stem of the bong to finally be ready for you to inhale and enjoy. Another feature that I find really useful is the carb hole that helps you control the intensity of your hit. The bowl is large and you can easily connect with an a18.8mm joint to the downstem. The glass of this bong is also very thick for better durability and for better stability they have even added a layer of 20mm glass in the bottom of the base.