The Alvin Griffin Drafting Chair DC710-40 is a sturdy and stylish ergonomic task chair with a height and depth adjustable mesh back and black fabric seat upholstery. The back rest is 16 inches wide and 8 inches high, and the molded foam seat cushion is 17 inches long, 17 inches wide, and 3 inches thick. You can adjust the seat height from 23 to 33 inches with the pneumatic control lever. The seat cushion is contoured to conform to your body for extra comfort. This artist's chair has a 25-inch diameter reinforced nylon base with swiveling wheels. The black adjustable foot ring measures 18 inches in diameter.