Therapists Choice Mini Exercise Ball 23cm (9 Diameter) Mini exercise balls are an excellent tool for core strengthening exercises. They can add an extra dimension of balance or resistance to your workout routine when positioned between your arms or legs or between you and the floor or wall. For yoga and pilates they can provide extra focus. Lightly inflated they can be used for grip strengthening Soft texture is easy to grip Ships deflated. Comes in clinical packaging and only includes 1 ball plug and straw inflator