Black Leaf Bong Drum Percolator + Inline SlitBong from Black Leaf made of borosilicate glass with double smoke cooling and smoke filtering. The inlineslit diffuser as well as the drum percolator provide heavy air and water swirls. As a result, the smoke is well cooled and filtered. The highlights at a glance: Inlineslit diffuser for smoke cooling and filtering Drum percolator for smoke cooling and filtering Suitable for dabbing The bowl for herbs has a pull up handle. The passage is ca. 6mm. We