Jobri’s most popular designed kneeling chair featuring a strong, rugged frame with easy height adjustment.Black steel frame with nylon casters.Gas height adjustment.Supportive polyurethane foam covered with durable fabric.Overall width:27" (Star Base).Height range:22" to 27"Seat size:16.5" x 14.5".Knee cushion size:16.5" x 9.5" contour molded foam.Optional Back available.