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Pure Glass Bongs feature percolators to enhance the crisp, clean hit. The glass is 5mm thick and Pure Glass Bongs can feature one, two or three percolators within them (categorized below). The percs themselves will be either Dome Percs or Tree Percs, sometimes color-worked and sometimes clear. All of the Pure Glass Percolator Bongs come with diffusers and bowls (often color-worked), or even pre-coolers depending on the design.