Zob is one of the original high end glass manufacturers, starting in the 90's. If they've perfected anything in their decades of success, its that the key to making the perfect piece is all in the percolators. Every piece has the perfect level of filtration and airflow, and are all produced in Los Angeles, California using borosilicate glass. Zob is not just selling you a bong to last you a year, they are selling you a bong to last a lifetime.