These diffused downstems and glass downstems for your bong that go above and beyond the standard performance of a downstem. These downstems are more advanced then a classic downstem with one hole or a few slashes - These downstems are diffused with percs such as showerhead percs, matrix percs, tree percs, gridline percs and more! Many of these diffused stems have smaller holes to allow the percs to function, and are best paired with an ash catcher to avoid clogging!