Lightweight soft plastic stackable student chair is available in six popular heights. This one-piece soft plastic polypropylene chair shell promotes good circulation, relieves pressure points and provides flexibility in the upper back while supporting the lower back. The legs are 1 1/8" 18-gauge tubular steel (16-gauge for 18 1/2" A+ and 20 1/2" A+). Available in full nickel chrome frame or black powdercoat and stack 10 high. Select from nylon, steel, felt or rubber glide options. Please order a minimum of 4. Optional field installed book basket available for 20.5"A+, 18.5"A+ and 17.5".