... material, squeezable, CE standard, including water ball inside which will pop out when stress the skull. 1. witch shape, size in 8cm ... , CE standard, squeezable.3. including water ball inside which will pop out when squeeze witch.4. existed white color, different color available ... .6. a good kind of exercise ball, relax hand & fingers.7. popular in halloween holidays, fit for child up 5 years ...