product description 1. 6-piece set - convenient for you to change and clean in summer. 2. Made of soft, low odor, flexible and durable PVC. Gym-grade explosion-proof, non-slip, stays elastic and soft in any complex pose. High safety - the fitness ball is relatively safe during exercise and is not easy to be injured. 3. Multifunctional mini exercise ball - suitable for sisters with overweight belly, hands and legs. Exercise balls are good for injury recovery and rehabilitation (especially for spine and pelvic exercises). 4. Improve people's flexibility, strength, balance, posture, cardiopulmonary function. For women, long-term use can effectively make your body shape and shape the perfect curve. For older people, exercise the spine is very effective. The mini yoga ball is a practical ball, small and portable, which can be carried anywhere in the gym/travel/training. 5. Yoga Ball Inflation Method - Each product comes with an inflatable tube, you can use it to easily fill the yoga ball with air. Note that for better recycling, we recommend that you only fill it with 70% to 80% air.