Sturdy 0.88' O.D. 18-gauge steel tubing with fixed legs. Seat has a 14' diameter with an 11.5' diameter, 0.5' vinyl padding riveted through the steel seat pan. Foot rings with 0.63' O.D. are welded to each leg by four contact points for added rigidity. Features height-adjustable legs that adjust in 1' Increments up to eight additional inches. 4.75 mm MDF board, with rivet heads fully embedded.