Patterned Black fabric upholstery Pneumatic seat height adjustmentHeight adjustable armrestsInfinite seat tilt lock with tilt tension adjustmentBack angle adjustmentBack height adjustment via internal ratchetSeat sliderScuff resistant arched molded base with twin wheel carpet castersSoft casters (OTG10700) are available26.5w x 23.5d x 39hSeat Height: 17.5 - 21.5"Seat Width: 20.5"Seat Depth: 17" - 19"Back Width: 19"Back Height: 19.5" - 22.5"Arm Height: 8 - 11''