Features： 1、It is made of durable, high?elastic materials, which is flexible and suitable for all ages. 2、Because of the small size of the hand exercise ball, it can be carried in your pocket, and it can also be taken out to kill time on the trains or in the car. 3、Using high elastic band, won't curb wrist, flexible rolling, not easy to slip off, convenient for use. 4、Double row buckle, double fixation, you can adjust the size of the ring at will. 3pcs of exercise ball are available for use. 5、Suitable for hand rehabilitation training, exercise strength and finger flexibility, activate the joints. Specification： Item Type: Finger Exercise Ball Material: Silicone Functions: 1. Rehabilitation training 2. Exercise knuckles and palm muscles 3. Press the fingers and activate the joints 4. Exercise finger and arm strength. How to Use: The size of the training ball is not large, just hold it in the palm of your hand, hold the training ball and pinch it hard, you can feel the pressure of the training ball on your fingers. Generally, if you keep holding it for N times, you will feel numbness and heat in your palms, and then you will feel very comfortable. Because when you squeeze the force ball hard, the flexible ball deforms and fills the palm. As the palm becomes loose and tight, the ball can effectively stimulate the major acupuncture points of the palm, promote blood circulation, and achieve the effect of exercise and healths care. Basic Exercises: Hold the strength training ball completely in the palm of your palm, and do ten times hand stretching exercises, first doing right hand exercises and then left hand exercises, alternate exercises. Suitable People: 1. Rock climbers and bodybuilders trains finger and grip strength; 2. Fans of badminton, table tennis, basketball and other ball sports; 3. Learn to play the piano and exercise finger strength; 4. For people who use the computer keyboard and operate the mouse for a long time Cleaning: In order to prolong the service life of the silicone strength training ball, it is recommended to wash gently with water Package List： 3 x Massage Ball