Hyperice Hypershpere Go Vibration Therapy Exercise Ball Entire Body (1235904_EA) 1/EAA massage ball that targets your tightest muscle regions with precision Ideal for using after a workout and after spending too much time sitting down A hard outer shell optimizes vibration intensity and muscle connection. Textured rubber skin helps improve grip and softens the contact on the body. Three powerful speeds of vibration (low, medium and high)