Durable and tear-resistant material - The ergonomic anti-stress ball consists of a tear-resistant gel core and stylish non-stick fabric. Using unique production methods, we have created a smooth stress ball that retains its shape and feel that allows you to enjoy maximum grip and comfort. Perfect shape and size: Round shape for a comfortable fit in your hands. The diameter of each ball is 2.3 inches/5.8 cm. The size is suitable for adults, and easy to carry, you can exercise fingers wherever you want. Soft and hard balls: The set contains 1 x green soft ball and 1 x grey hard ball. Ideal for improving grip strength, hand endurance, dexterity, muscle tone and fine and overall motor skills. Relieve your stress and anxiety: Ideal for reducing physical discomfort and relieving mental tension in your body. Each pressure will improve concentration, relieve anxiety and soothe the mind. A good choice to avoid tension and relieve pressure. Strengthen your grip, joints and muscles: every time you touch the balls, it will increase the blood circulation of your hands, relieve joint pain and strengthen your gripping power. Optimal for rehabilitation exercise, strengthening hands.