The doobiewood® is an adapter between self-made and 5.9 mm activated carbon filters (XTRA Slim Size). Its tapered hole on the front allows the insertion of joints of various sizes, while the hole on the back guarantees a tight fit for activated carbon filters. The oil applied to the outer surface protects against moisture and other external influences. The company relies on American walnut for its doobiewoods - a hard-wearing and dimensionally stable precious wood from the north of the USA. The doobiewood is packed in a cotton drawstring bag together with a flyer, sticker, pipe cleaner and three activated carbon filters.