Sunny Health & Fitness Anti-Burst Gym Ball Improve balance and flexibility: Utilize the anti-burst ball to strengthen, tone and build muscles throughout your body. Utilizing an Aerobic Ball is excellent for improving and developing flexibility and coordination Available in different sizes: Available in 55cm, 65cm, and 75cm. Versatile sizes fit and form to fit your body. Exercise ball will support you during longer exercise and stretching sessions Anti-burst pvc construction: Thick pvc casting provides superior puncture resistance. If punctured, the ball will slowly deflate keeping your body safe Total body: Perfect for yoga, Pilates, stretching, & more, this durable yoga ball is made with anti-burst PVC construction. Strengthen your overall body muscle trying various workouts or stretching exercises Inflation pump included: Convenient inflation pump is included so you can easily inflate your fitness ball. Slow deflating mechanism is designed for slow deflation if accidentally punctured