Black Leaf - 4-arm Perc Ice Bong - Ashcatcher - Green - Without Carb Hole - Glass Bongs - Bongs & Waterpipes - Smoking Pipes - Grasscity.com heres the link I kinda have been looking at buying this bong. I like everything about it and the reviews are good. I just dont quite understand the 4 arm tree perc part of it and the aschcatcher? I dont understand how they work and what the 4 arm tree perc does? HELP?