Features:1. Made of high quality polyurethane fiber material, waterproof and oil-proof, to keep the ball elastic.2. Using TPR soft rubber, springback and good wear resistant, safe and healthy without peculiar smell.3. Great for palm acupoint massage/hand grip exercise/finger joint movement.4. Small size and lightweight, easy to carry and store, can carry it in your pocket, convenient to use.5. Can effectively stimulate the palm of each point, promote blood circulation, grasp strength exercise, finger joint activities to exercise health care effect.6. Suitable for elderly, white-collar worker, people with high stress, hand rehabilitation exercisers, hand strength exercisers, etc.7. Usage: basic practice: hold the ball completely in the palm of the hand, do ten times of hand stretching exercise, first for the right hand exercise and then for the left hand exercise, alternate practice.Specification:Condition: 100% Brand NewItem Type: Round Grip Strength Training BallMaterial: TPR Soft Rubber + Polyurethane Fiber Optional Color: Pink, Blue, Yellow, Green, BlackWeight: Approx. 84gDiameter: Approx. 5.5cm/2.17inchPackage List: 1 x Round Grip Strength Training Ball