Ofm Big And Tall Executive Chair - 17-1/2" To 21-3/4" Seat Height - Vinyl - Black - Black Seat Height: 17-1/2-21-3/4" Seat WxD: 24x21-1/2" Back WxH: 24x25" Adjustable: seat height, tilt, tilt tension, 360 swivel Material: Vinyl upholstery