This 20 inch tall cylinder bong from Grace Glass is a true lung buster. The 6-Arm revolver-style diffuser at the base of the massive downstem is only the start of the process of breaking up and cleaning your smoke. Once through there the smoke has to rise through an 11-Arm tree percolator which filters out every single solid particle left in the smoke. Above the perc are a trio of ice spikes so you can always drop in a few cubes for that extra chill session but even if you don't add ice, the spikes do a great job of stopping the last few bubbles from making it any further up the tube. They have built in a carb hole but it is blocked by a rubber bung when it arrives so you don't have to use it if you don't want to and they have added some nice color accents to the base, perc and mouthpiece. The downstem uses a massive 29.2mm fitting so that the bowl can use an 18.8mm joint without any restrictions in airflow which allows for so massive rips when you clear it hard. Lastly, to make this thing as stable as possible they have given it a really thick 20mm base to add weight to the bottom. This is only for the serious bong hitter.