Premium Material: The Balance Ball is made from PVC and PP, which is lightweight, wear resistant, sturdy for long time use, and easy to cleanAnti Slip Design: The anti slip pattern enhances user stability to the maximum extent, allowing you to securely stand, jump, kneel, or lie on this balance training equipmentFeature: With a strong load capacity, it is very convenient to carry and store in the gym, at home, or in the office. The included air pump can help you adjust resistance as neededVersatile: Half Ball Balance Training is fit for push ups, squats, sit ups, mountain climbing exercises, lunges, planks, and many other workouts to make full use of your home fitness routineProduct Size & Package Contents: The balance ball has a diameter of 48cm. The package includes 1 ball + resistance bands + air pump Specification: Material: PVC, PP Size Chart: Diameter: 48cm/18.90inch Package Includes: 1 Balance Ball1 Air Pump1 Pair Resistance Bands Note: Please allow slightly errors 1-2cm differences due to manual measurement.