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Croia Glass 15" Scientific Glass Bong with Tree Perc & Spiral Cooling | Croia Glass Fits Water Pipes with 14.5mm Female Joints This 18” triple-perc powerhouse delivers15" Scientific Glass Bong with Tree Perc & Spiral Cooling Croia Glass The Croia Glass 15 inch scientific glass bong blends advanced filtration engineering with a striking mechanical aesthetic. Built from premium borosilicate glass, this design combines a multi arm tree percolator, an internal spiral cooling coil, and a recycler inspired chamber layout that guides smoke through multiple cooling stages. The result is a visually dynamic bong that