Feature:1. Palm Massaging: Hand squeeze ball adopted multiple convex point design, provide 3D hand and palm massaging, activate acupoints and relieve fatigue. 2. Health Care: Hand strength exercise ball with a perfect size, suitable for your palm, which can stimulate acupoints to reduce disease and promote health. 3. Stimulate Acupuncture: Hand exercise ball fully covered with soft thorns on the surfaces, good for stimulating your hands while exercising your grip strength. 4. Widely Use: Grip strength trainer ball is suitable for hand spasm, arthritis, and stroke, which is a stress ball for mobile phone and computer enthusiasts. 5. Soft TPR: Hand grip training ball made of high quality TPR material, odorless, soft and comfortable, no easy to break, which can be used for a long time. Specif