Pneumatic seat height adjustment with a hinged back that changes angle to suit the users' body shape;Scuff resistant outer shroud protects the back of the chair and adds support;Dual wheel carpet casters provide easy movement on carpet floors;Ideal for office or home;Charcoal grey;Dimensions: 18" W x 22" D x 32" H;Adjustable seat height: 15.5" to 20.5";