CalCore Professional Strength Swiss Ball for Office, Exercise, Stability and Fitness FULLY ADJUSTABLE EXERCISE BALL FOR SIZES BETWEEN 45 CM AND 65 CM to fit your individual needs FANTASTIC YOGA BALL FOR BURNING CALORIES AT WORK, AT HOME OR IN THE GYM USE THIS STABILITY BALL TO SLIM DOWN AND TONE UP WHILE STRENGHTENING YOUR CORE DOUBLE ACTION HAND PUMP INFLATES BALL QUICKLY TO JUMPSTART YOUR FITNESS WORKOUT ROUTINE LIFETIME WARRANTY: If you are every not satisfied with this CalCore fitness ball, CalCore will work to make it right.