Feature: 1. Made of TPR material, which is soft and comfortable, with good elasticity, great for individual exercise 2. Small Size and portable hand exercise tool that you can take with you anywhere, you can exercise at home, office, travel, etc. 3. 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 4. Breathable and not stuffy, the raised bumps can effectively reduce the touch between the skin and the sphere, comfortable to hold 5. Suitable for hand strength 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 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 Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.