Floor and riser mount standards are formed with 1" x 3", 11 gauge steel. The horizontal beam option is constructed from 1-1/2" x 2", 11 gauge steel. The folding writing tablets are high-pressure plastic laminate and lacquered a complimentary color to the laminate. The tablets are constructed from 5/8", 11-ply hardwood and the armrests are laminate-surfaced solid hardwood.