the middle marble

making it the perfect conversation starter for your next gathering or a proud addition to your personal collection

Compact and travel-friendly

it caps perfectly with any carb caps and creates a better seal

It features a button style disc percolator so those powerful rips are water filtered and smooth

15" Scientific Glass Bong with Tree Perc & Spiral Cooling grinders the middle marbleThe 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 delivers smoother hits, cooler airflow, and an unmistakable futuristic