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 19 inches has dual UFO percolators – which are carefully tuned dome percs – so the function is insane. A slotted stem in a beaker of water is already stacking, and then you pull through two UFO percs in a row, into a splash guard perc at the top with ice pinches and a small ice chamber. Filling the top with crushed or snowcone ice really cools things down, and with this level of percolation it’s a really smooth pull. 14mm high quality snap bowl comes with. 5mm tubing makes for a solid piece. This bong has beautiful green Zob labels. Zob Glass is proud to be American glass made in California, and here at Columbia River Glass we only support American glass!