Karma | 11" Dual Tree-Perc Bong11 inch Dual Tree Perc Bong from Karma is here to revolutionize the way you smoke. Get ready for hits so smooth, it's downright scary. The dual tree percolators act as a symphony of bubbles constantly working to turn harsh smoke into the softest, coolest, velvety clouds. These powerful double tree percs split your smoke into dozens of little bubbles, maximizing filtration and cooling before it even thinks about hitting your lungs. You end up with