The lightweight National Public Seating 8100 Series Poly Shell Stack Chair is ideal for environments such as cafeterias and lounges. This chair features a one pc. seat and backrest made from a high-density, injection-molded, color-impregnated polypropylene shell. The 17-gauge square-tubed frame has six stack bumpers to protect the folding chair's chrome-plated finish and extended shields to prevent the user from any undesired snags or pinches. Under the seat are three cross-braces for added support and strength.