CalCore Fitness Brand Professional Physio Ball Chair for Office and Home The perfect chair for office fitness and improved posture Great for anybody looking to burn calories while sitting at a computer Shown in clinical studies to help posture and strengthen core muscles Adjustable diameter between 25 and 29.5 inches (75 cm) makes it the ideal size to use in place of an office chair Silvermist grey color blends in with any office environment and rapid action foot pump makes inflation a breeze One adjustable diameter CalCore Fitness Exercise Ball Chair (25.5&#034; - 32&#034;) One Rapid Action Foot Pump Emailed to you:  Fitness e-book with inflation instructions DESK CHAIR REPLACEMENT HOME GYMS PHYSICAL THERAPY YOGA WEIGHT TRAINING