Cylinder Bong with 11-Arm Tree PercThis 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