... 65mm dia, anti stress ball, good for fingers to do exercise, relax hand at the same time, different color available. ... 3. spiky ball skin, good for fingers to do exercise & relax hand too.4. easy to take, can ... do exercise anytime when you want to.5. existed orange, blue ... child up 3 years old.7. a good kind of exercise for indoor & outdoor, child & adults.8. packing, 1pc/ ...