Durable chrome-plated 12 gauge steel frame stands up to continued use. U-shaped base promotes safety, while permanently attached polyurethane glides allow for quiet movement on all floors. Ergonomic, blow-molded contoured seat allows for increased comfort and promotes good posture. Save floor space after class wraps up and stack these chairs together. Supports up to 300 lb. Each seat is 16-3/4"L x 16-3/4"W. Small is 18"H; 9-1/2 lb. Medium is 22"H; 11-1/2 lb. Large is 24"H; 12 lb. Available individually or in Group Sets of 6.