Get better support for your back and spine while you sit at the office or at home with this ergonomic desk chair. Incorporates a balance ball to improve your posture, spinal alignment, and core strength. Balance ball measures 65 centimeters in diameter. includes a pump, and is made of latex-free, anti-burst materials.Includes: 1 Cover 1 Deflated Ball 1 Pump 1 Base.Helps Support Proper Posture And Can Be Used For Yoga ExercisesDimensions: (Ball is 65 in. in Diameter)Can Be Used As A Stand Alone Yoga Ball Or As A ChairCover Is Machine Washable.