The 9300 Silhouette stack chair is durable and classy enough to use in your busiest social setting, be it a dining room or corporate banquet hall. It features a strong square 18-gauge steel frame plus an under-seat H-shaped brace for extra support. The seat features supremely comfortable and spacious 2 inch -thick high-density foam padding with institutional grade vinyl upholstery or fabric, and a waterfall-style edge. MDF core within both the seat and crown-style backrest which has a built-in handle for easy moving and stacking. Fortifying stacking bars and twelve plastic bumpers protect the powder-coated paint finish from scratches when the chair is stacked (up to ten units high.)