With comfortable and cost effective seating, this 17-1/2" 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 is used to stop bothersome static electricity. Rivets are not exposed to prevent clothes from snagging or tearing. 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 13-1/2", 15-1/2", and 17-1/2" chairs.