Certificate in accordance with European Standards EN 1176 by the German TÜV - SÜD.Supporting structure made of tubular galvanized steel section 4x3 cm.Parts list:N°1 platform of support in birch plywood glued with phenol-slip milled and finished with colored films.N°1 with a circular sofa seat and back with five strings made of tubular galvanized steel and painted in the oven to 180 degrees.N°1 in the central stem, phenolic glued birch plywood finished with colored films.The rotation system consists of load bearing rollers.Assembled by 8.8 galvanized steel bolts and nuts. Elements covernut under colored nylon.