set2: 1 x Hand Grip Dynamometer + 1 x PU Ball Ball elastic PU, ball cover: the standard version is fabric adhesive tape About 7cm in diameter, for adult use Rehabilitation training for hand function problems refers to grip strength, small hand muscle strength exercises and fitness The strength is small and the hand feels soft, which can facilitate the user's grasping and finger training, and the ball not fall off Ergonomic and comfortable, Compact and , strengthen your forearm and wrist force anytime, anywhere. ABS material has high strength, resistance, high-temperature resistance, , wear-resistance, and durability, etc., which increases the service life of the product. Giant screen display, 42mm diameter, solid pointer display clear. By training the reaction ability and strength between the fingers, the fingers are more flexible, and the fingers are more skillful and enhance the strength of the fingers. Comfortable grip, Four fingers fit, can make better use of strength. Colour: blue + black Material: pu/plastic Hand Grip Dynamometer size:165 x 75mm Package Contents: 1 x Hand Grip Dynamometer 1 x PU Ball Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.