Offex BT-6138-1-BK-GG Mid-Back Task Chair, Black Mesh Seat size: 15.5''w X 14.75''d; Back size: 14.75''w X 14''h; seat height: 17.25 - 20.75''h Upholster: black mesh Material: foam, mesh, nylon, steel; chair type: mesh-chairs; assembled: yes Color: black; finish: black nylon Overall dimension: 23.5''w X 23.5''d X 29.25'' - 34''h; shipping weight: 16 lbs.