Therapist's Choice Fitness Anti-Burst Exercise Balls: 3 55cm, 65cm, 75cm - for Fitness, Therapy, Sports Training, Yoga and More Made of special durable PVC material that prevents bursting. Deflates slowly if punctured Helps Develop Overall Body Muscle, Balance and Co-Ordination Perform a variety of exercises designed to tone and strengthen core muscles. Provides a Total Body Workout and Develop Balance and Coordination PUMP NOT INCLUDED