Gaiam Balance Ball Chair Black Gaiam Balance Ball Chair Black comes with a removable, anti-burst Balance Ball (22 in/55 cm) that is free of latex and the six most harmful phthalates, and also includes redesigned base that cradles your ball, easy-glide casters, air pump and exercise guide for people 5' to 5'11 tall. Easy, 1-tool assembly required. Strengthen your core as you sit in ergonomic comfort to help improve spinal alignment and reduce nerve compression. The Ball with Chair measures 21W x 31H x 22D and weighs approximately 13 lbs. Helps to improve spinal alignment and reduce nerve compression Get a total body, muscle-sculpting workout without weights or a personal trainer Comes with a removable, eco-friendly, 6P-free Balance Ball (55cm) Strengthen your core as you sit in ergonomic comfort Uses professional-grade anti-burst ball thats free of latex and the six most harmful phthalates Redesigned base that cradles your ball for added stability and durability Includes easy-glide, lockable casters, air pump and exercise guide Included medium-resistance body band tones your arms, legs and midsection Easy, 1-tool assembly Dr. Randy J. Weinzoff, D.C., a 1990 graduate of Palmer College of Chiropractic, has been providing a full spectrum approach to health and well-being for more than 14 years. A member of the National Strength and Conditioning Association, Dr. Weinzoff specializes in exercise and sports rehabilitation, nutritional analysis, and alleviation of chronic pain. Patented designe promotoes correct posture and imporves circulation. The balanceball removes easily for quick workspace exercises. Desktop Guide shows you stretching and strengthening techniques. History of GaiamFounded in Boulder, Colorado in 1988, Gaiam is a provider of information, goods and services to customers who value the environment, a sustainable economy, healthy lifestyles, alternative healthcare and personal development.