Budget-friendly, large, ergonomically designed seat/back is injection-molded polypropylene. Frame is powder coated for durability. Leg and back supports are mig welded to innovative brackets and will hold up in the most strenuous situations. Integral heavy-duty twin-tube back supports offer more strength, comfort, and support than other chairs. Can be stacked or turned over on desks or tables. Chairs ship with matching colored ball glide feet unless self-leveling glides are requested, which costs an additional $3.99/chair. 10 year warranty. Additional shipping charges apply, quote may be required.