Features： 1、Three?dimensional massage point, with multiple convex point design, activate acupuncture points, massage hand, relaxing massage, and relieve fatigue. 2、Acupoint massage design in the reflection area of traditional Chinese medicine, stimulates acupuncture points, regulates the yin and yang qi and blood in the human internal organs, promote healths. 3、Cross finger design, if the user's fingers are not flexible, the cross finger design can effectively prevent the ball from falling off. 4、Breathable and not stuffy, the raised bumps can effectively reduce the contact between the skin and the sphere, comfortable to hold. 5、Suitable for hand rehabilitation training, exercise strength and finger flexibility, convenient and practical. Specification： Item Type: Finger Exercise Ball Material: TPR Size: Approx. 12.3 x 9.3cm / 4.8 x 3.7in Product Introduction: Using durable high-elastic materials, flexible, suitable for all ages, can exercise hand muscles and finger flexibility, and is suitable for primary strength training and rehabilitation training. Function: Exercise finger and arm strength. The volume of the training ball is not large, just hold it in the palms of your hand, hold the ball in your hand, and pinch it hard, you can feel the pressure of the ball on your fingers. Generally, if you continue to hold it for N times, you will feel numbness and heat in your palms, and then you will feel very comfortable. Because when the exercise ball is pressed hard, the flexible ball deforms and fills the palms of the hand. As the palm becomes loose and tight, the ball can effectively stimulate the major acupoints of the palm to achieve the effect of exercise and healths care. Basic Exercises: Hold the exercise ball completely in your palm, and do ten times hand stretching exercises, first doing right hand exercises and then left hand exercises, alternate exercises. Suitable People: 1. Extensor muscle and finger extensor function exercises to prevent and correct contracture stiffness. 2. Paralysis of wrist extensor and finger extensor muscles (radial nerve palsy). 3. In patients with hemiplegia, the fingers and wrists are dysfunctional, and the fingers and wrists are weak. Through training, the muscle strength and joint activities of related parts can be improved. 4. Control the increase of flexor muscle tension and the atrophy of muscle of thenar. 5. Prevent finger flexion and spasm, prevent finger joint deformation and deformity. 6. While correcting the fingers, it assists in training the flexibility of the fingers. Usage: 1. Put in four fingers 2. Hold the ball 3. A loose and a grasp 4. Hand training Package List： 1 x Finger Exercise Ball