This 15-1/2" chair features a sleek design and heavy-duty construction that is built-to-last. The body is high-density linear polyethylene - one of the heaviest plastics in the industry. A special additive stops static electricity. Rivets are not exposed to prevent clothes from snagging. The chairs have 16-gauge tubular steel legs with a crossover design for extra strength. The "V" cut in the chair back provides air ventilation. Available in a four-leg or sled base style. An optional bookbasket is also available on 11-1/2", 13-1/2", and 17-1/2" chairs.