The Cheech 18-inch Double Tree Perc is a full-size beaker bong built around two tree percolators. Each tree perc has a row of slits that break the smoke into fine bubbles, and with two of them the smoke gets filtered twice on the way up, which cools it and smooths the draw noticeably more than a plain downstem alone. The beaker base adds water capacity and a stable footing under all that. At 18 inches it's a sizeable piece, and the double percolation makes it one for people who want the smoothest hit rather than the simplest setup. It's built from durable Cheech glass for regular use.