The Gaiam(R) Classic Balance Ball Chair provides all-day ergonomic support for a stronger healthier back. By sitting on the ball, you'll improve your posture and spinal alignment while getting a powerful core-strengthening workout. Product Features Ergonomic back support and spinal alignment Strengthens your core as you sit With anti-burst, 52cm Balance Ball Easy one-tool assembly Stable, yet lightweight base is made from molded PVC Designed for heights of 5'-5'11" and weights up to 300 lbs. Desktop workout guide provides an effective low-impact workout and stretching routine Rolling, lockable caster wheels Latex-free Additional Details Measurements: 22"W x 31"H x 22"D; 13 lbs Weight Capacity: 300 lbs Height: For those 5'-5'11" tall Compatibility: 52cm balance ball