This Smiley Face Hand Exercise Ball Is Designed To Fit Comfortably In Your Palm, Making It Ideal For Individuals With Arthritis, Carpal Tunnel, Or Weak Hands. It Strengthens Fingers, Forearms, Hands, And Joints, Improving Grip And Endurance While Relieving Stiffness And Joint Pain. Made From Highly Flexible Foam, It Retains Its Shape Even After Repeated Compression. Use It To Increase Flexibility, Dexterity, And Reduce Stress And Muscle Tension, Offering A Great Way To Relieve Stress And Enhance Hand Mobility.