The Tone Fitness anti-burst stability ball is an easy-to-use, highly effective accessory for core conditioning, balance training and spinal stabilization as well as weight training and physical therapy. They can be used in Yoga, Pilates, and fusion exercise programs to strengthen and firm abs, back and buttocks. Comfortable, convenient and durable for effective total body workouts. Features a durable, burst-resistant shell. Deflates slowly when punctured. Ideal for home use. Warning: This product contains one or more phthalate chemicals known to the state of California to cause birth defects and other reproductive harm. Consumer may return the product for a full refund, including shipping cost for both receipt and return of the product within 15 days of his or her receipt.