Large seating pieces which can be completed by free single backrests. Steel structure provided with elastic belts and plastic spacers. Padding in differentiated, stress resistant expanded polyurethane. Padding of the seating area made of polystyrene spheres, polyester and polyurethane fiber. The backrests can be positioned on the seating platforms as desired; this way each element can be a different appearance each time. Padding of backrests made of polyester fibre and expanded polyurethane; base provided with ballast. Fixed cover in polyester fibre and poyamide; removable upholstery cover available in a selection of fabrics in the collection.