Kings Brand Black Fabric Gas Lift Adjustable Rolling Chair ~ Medical Stool Kings Brand Black Fabric Gas Lift Adjustable Rolling Chair ~ Medical Stool. An elegantly neutral piece that's perfectly at home in virtually any dcor style. Padded seat swivels 360 degrees, with adjustable height. Dimensions: 22"W x 22"D x 26~30.5''H Seat height is 17.5~22", Seat cushion is 16" W X 16'' D, Back cushion is 16" W X 8.5'' H, Seat height is 17.5~22". Simple assembly required.