Featuring a large high density moulded foam seat, the Buro Revo office stool is an ideal addition to workspaces. With a ring operated adjustable seat height and an optional architectural gas lift, this versatile stool is a popular choice for students, laboratories and healthcare professionals. Or used as an architectural drafting stool. Features Colour: Black Vinyl Upholstery Adjustable seat height Ring operated gaslift High density polyurethane moulded foam 90kg weight rating 4-5 sitting hours 98% recyclable 10 year warranty Dimensions: Seat size (mm): 350 (diameter) Seat height (mm): 490-675 Overall size (mm): 540w x 555h x 500d Custom Options Architectural 270mm gas lift (111-6) Height adjustable shiny black powder coated architectural foot ring (110-4) Polished aluminium base (PC068) Chair glides (CE1151P) Various height gas lifts Soft PU castors (CE1121P) Customer specified fabric.