PurAthletics 55cm/22″ Exercise Ball. Burst Resistant to 300lbs and 700 weight holding capacity. Well- suited for home use. 55cm/22in size for users 5ft-5ft 6 inches 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. Pearl Red Color Includes Hand Pump, Instructional Sheet, Plug Remover, Free downloadable Instructional Video at zenathletics