Within the metal frame of the Quadro collection, panels of different materials can be inserted: glass panels (extra-clear mirrors, smoked, colored, textured), lacquered panels, solid panels, either smooth or textured, and wood essences. The metal frame of the Quadro collection features a small extrados for easy opening. There are two variants available: a frame with a thickness of 3.5 cm or a flat version that creates a simple raised edge.