Sturdy 0.88' O.D. 18-gauge steel tubing with fixed legs. Seat has a 14' diameter with a 11.5' diameter, 0.5' vinyl padding riveted through the steel seat pan. Foot rings have a 0.63' O.D. and are welded to each leg by four contact points for added rigidity. 4.75 mm MDF board with rivet heads fully embedded.