... in 65mm dia, anti stress ball, good for fingers to do exercise, relax hand at the same time, different color available. 1 ... ball skin, good for fingers to do exercise & relax hand too.4. easy to take, can do exercise anytime when you want to.5 ... child up 3 years old.7. a good kind of exercise for indoor & outdoor, child & adults.8. packing, 1pc/hangtag, 12pc ...