20" GRAVlabs 10 arm tree perc tubes made from german schott glass. Comes with a low profile showerhead downstem and funnle bowl. All glass scientific connection. Stright tube style with hourglass style ice-catcher. Very nice 10 arm tree perc .Uses a water percolation cycle by adding an addtional water chamber so you get more filtration when you hit it for and extra stronge and extra smooth hit. Must have for any GRAVlabs or any waterpipe fan.