Boost Focus & Energy Engages micro-movements that stimulate muscles and mind, helping improve concentration and productivity whether at home, school, or the office. Ergonomic Support for Better Posture Designed with the help of chiropractic experts to reduce lower back pain and promote upright sitting by strengthening your core muscles. Custom Fit for Most Desks Ideal for users 5' to 5'11". Compatible with most standard desk heights. Add 2 with Gaiam Leg Extenders (sold separately) for extra height. Complete Set Included Comes with a 52cm removable balance ball, chair frame with 4 caster wheels (2 lockable), metal support bar, air pump, and exercise guide. Weight limit: 300 lbs. Assembly & Inflation Tips Easy to assemble in minutes. Follow inflation instructions for best results: initial inflation, rest period, then full inflation to 52cm.