Black Leaf Flask Bong RingsThe beaker bong 'Rings' by Black Leaf is equipped with an adapter + bowl plug in system. The lift off bowl for herbs has a very small passage, so no screen is required. With its diffuser slits, the adapter gets the water flowing and the air swirling. Both ensuring cooler smoke. tube very easy to grip due to ring design robust and stable rimmed mouthpiece Made of borosilicate glass. With Black Leaf print.