PARTYSAVING Supportive Hydraulic Massage and Salon Stool &ndash; Extra Large, APL1159 Extra-large, round 360 degree pivoting seat with a 14 in diameter seat surface Firm, 3.25 inch thick seat, made of cushioning foam that gradually softens, ensuring longevity. Pivoting castor wheels roll smoothly on all surface types without causing damage. Hydraulic gas lift makes height adjustment as simple as the pull of a lever. Height adjustable from 18  23.5 inches / Weight limit of 230 lbs