Black Leaf Recycle Bong Herbs and OilCute BLACK LEAF glass bong that seems more innocent than it actually is! First, you are spoiled for choice whether you smoke herbs or dab oil wax, because the glass pipe is equipped with both a lift off bowl for herbs as well as a banger for vaporizing oil wax. To cool the smoke before inhaling, there is a drum percolator. This provides a lot of air turbulence and water bubbles in the belly of the bong, which cools the smoke and provides a smooth,