16" Double Tree Perc Straight Tube BongDouble Tree Perc Straight Tube Bong The double tree perc setup stacks two multi arm percolators inside a tall straight tube, shredding smoke into fine bubbles before it ever reaches your lungs. Every pull feels cooled, controlled, and stupidly clean. This is the kind of bong you rip when you want power without coughing up a lung five seconds later. Made from thick borosilicate glass, its solid in the hand and stable on the table. The straight tube