DescriptionHand therapy exercise balls build strength in the fingers, hands, wrist and forearms while reducing stiffness and joint pain by stimulating blood circulation in the forearm and hand. Perfect for athletes, musicians, office staff and students, as well as those with arthritis, carpal tunnel and rehabilitation needs.Features- Color: Green, Orange. - Material: Rubber. - Size: About 6.3X6.3X6.3cm/2.48X2.48X2.48inch. - Adoption of premium material, this product is durable, handy and long-time use. - This game helps train your sense of balance. - Exercise and strengthen hands, fingers, wrists strength so that relieve stress and muscle tension. - Releases tension and vents unwanted emotions for adults, teens and children. - Perfect for athletes, musicians, office staff and students, as well as those with arthritis, carpal tunnel and rehabilitation needs.