System of armchairs and two or more seater sofas. Internal structure in steel tubing for total disassembly with steel leaf spring to improve the flexibility of the backrest. Filler in CFC-free flexible cold processed polyurethane. Feet in steel tubing coated with epoxy powders in satin aluminium finish or in polished stainless steel. Covering in fabric, synthetic material, leather, customer leather or customer fabric.