High functioning science glass tube from Zob Glass out of California. “Instrumentum Percolatus” is their moniker as they make science glass with insane function through elaborate percolation. This large bong at 17.5 inches has their own Zobello proprietary implosion perc in a tube designed for radically stacking bubbles. An 18mm joint and stem leads to the disc of the Zobello where 3 holes, aimed right at each other in the disc, smash bubbles together and stack them like you wouldn’t believe! It’s a maelstrom of bubbles in there when you rip on this. You have a handy splash guard perc at the top, and some pinches so you can top your pull off with ice. Filling the top with crushed or snowcone ice really cools things down. 18mm high quality snap bowl comes with. 5mm tubing makes for a solid piece. This bong has beautiful black and white Zob labels. Zob Glass is proud to be American glass made in California, and we support American glass. Fantastic work!