PurAthletics 55cm/22" Exercise Ball with Burst Resistant to 300lbs and 700 weight holding capacity. Well- suited for home use. 55cm/22" size for users 5 to 5' 6" in Height. Non-slip texture and is ideal for toning & strengthening abs thighs & improving posture. Great for ball chair use while you work your core for Active Sitting while relieving back discomfort. Purple Color Includes Hand Pump Instructional Sheet Plug Remover Free downloadable Instructional Video at zenathletics.com