This 26cm tall 4mm thick glass bong has the lot. It comes complete with tree arm perc, ice pins  and ashcatcher.The Ash catcher will  trap ash and debris preventing it  from ending up in your bong water.The diffuser stem is a special type of modified downstem used on a bong bubbler, or water pipe… The slits of the diffuser break up the smoke so it makes smaller bubbles and is cooled even further by the bong water. The cooling effect makes for a smoother hit that is easier on the inhaler’s throat and lungs.