The lightweight 8100 Poly Shell series is ideal for environments such as cafeterias and lounges. It features a one-piece 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 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 and can be stacked up to 12 chairs high.