Libera is a chair with polypropylene shell, STACKABLE sledge base with arms, polypropylene glides with hooking device for straight rows. Available with REMOVABLE polypropylene writing tablet with anti-panic joint and metal frame.AVAILABLE MODELSLI | Polypropylene shell.LC | Polypropylene shell with padded seat.COLORS & FINISHINIGAvailable in different colors and finishingsCERTIFICATIONSEN 16139 / EN 1022 / EN 1728