specification: _x000D_Item Type: Grip Ball_x000D_Material: Silicone _x000D_Size: Approx. 58 x 44mm / 2.3 x 1.7in_x000D_Function: _x000D_1. Rehabilitation training_x000D_2. Activities calcined knuckles, palm muscles_x000D_3. Pressure finger, activating joint_x000D_4. Build finger and arm strength_x000D__x000D_Usage: The size of the grip ball is not large, just in the palm of the hand, hold the ball and hard pinch, you can feel the pressure of the grip ball brought to the fingers.Generally continue to hold many times, you can feel the palm numbness and fever, and then it is very comfortable feeling. Because when pinching the ball, the flexible ball is deformed and filled with the palm, the palm is loose and tight, the ball can effectively stimulate the major acupoints of the palm, promote blood circulation, and achieve the effect of exercise and healthy care._x000D__x000D_Basic Exercise: Hold the ball completely in the palm of your hand and do ten times hand stretching exercises, first with your right hand and then with your left hand, alternating._x000D__x000D_Applicable population:_x000D_1. Climbers and bodybuilders training finger strength and grip strength_x000D_2. Fans of badminton, table tennis, basketball and other ball games_x000D_3. Learn to play the piano to exercise finger strength_x000D_4. People use computer keyboard and mouse for a long time_x000D__x000D_Cleaning: In order to extend the service life of the silicone grip ball, it is recommended to gently wash with water Features: 1High?elastic silicone material, flexible hand feelings and suitable for all ages. 2Exercise palm muscle and finger flexibility, suitable for primary strength training and rehabilitation training. 3Suitable for people who use computer keyboard and mouse for a long time to work with their fingers. 4Exercise calcining knuckles and palm muscles, effectively stimulate the major acupoints of the palm. 5Small size of the grip ball can be easily put in the pocket, or taken out to kill time on the trip or in the car. PackageList: 5 xGrip Ball