They consist of stackable boxes in circular and oval shapes, enclosed by a leather lid. Each one is made up of four trays stacked one above the other, which can be slid out one by one and held together by the base in satin‑finished aluminium in a natural matte brass colour. All the containers of the Zhuang series are made of solid Canaletto walnut wood, hollowed from the solid via CNC machining, and finished with a leather band, enhanced by a very fine stitching with a slightly contrasting thread and the Poltrona Frau brand impressed hot‑foil.