Handy office stools tucks under work surfaces when not in use. Height range of 16" to 21" overall with 5" (140mm) pneumatic lift. 5-star, 25" dia. nylon-reinforced base with 3-piece telescoping dust cover and 2" nylon carpet casters. Seat cushion depth 1-1/4". Meets or exceeds ANSI/BIFMA standards. Black microcellular, self-skinning polyurethane foam seat. Assembly required.