Therapist's Choice Mini Exercise Ball 23cm (9" Diameter) Mini exercise balls are an excellent tool for core strengthening exercises Features soft rubber surface for increased comfort made from an environmental-friendly protection PVC, which passed 6P test Great for Pilates and building core strength Comes in clinical packaging and only includes, 1 ball and plug. Pump Not Included Product is made from an environmental-friendly protection PVC, which passed 6P test. Do not use if you have a PVC allergy or other health condition affected by PVC.