The ONDA flat bench, made of sheet steel 50/10 is obtained by folding two unique mirror sheets, with which a particular "wave" design is obtained. On the external parts of the seat, strong reinforcement plates are welded and at the base there are 2 plates with hole diam. 10 mm for fixing to the ground by means of special anchors (not supplied). The sheets are subsequently cold galvanized and painted with PP powders.