Solid kiln dried wood Eucalyptus Grandis (Saligna) 21mm thick seat with blunt corners, no sharp edges. Varnished all round. 9mm thick plywood backrest with blunt corners, no sharp edges and with a slightly bent shape. Varnished all round . 4-Legged steel frame 19mm diameter and 1.2mm wall thickness. Epoxy/polyester powder coated. For use with pop rivets. Stackable. Seat Supplied Loose