The strongest in its class, our 300 Series premium all-steel institutional-grade folding chair features a heavy-duty powder-coated 18-gauge tubular frame with a 2 1/4 inch frame strengthener on each side of the seat. Three double-riveted U-braces - one in front and two in the back - securely support the double-hinged legs. The seat is designed with a waterfall-style front for added comfort. A supportive full-sized double-contoured backrest features curled safety edges and is electromagnetically tack-welded to the frame. Color-coordinated V-tip stability plugs provide added reinforcement at the frame's junction and matching replaceable glides prevent floor damage. The 300 Series meets MAS Certified Green and ANSI/BIFMA standards.