The Teen/Adult Ball Chair, model 678, is a posture chair designed for office use by individuals with balance disabilities or back problems. This ball-shaped chair is designed to take pressure off the spine, reduce muscle tension, improve balance, and strengthen the torso. Features include an adjustable back rest and a latex free ball that can be inflated to the height of the user. DIMENSIONS: The ball is 22 inches. CAPACITY: 600 pounds. COLOR: Color may vary.