Easy to Use: The self-starting runners work independently in different directions to work your wrist joints. Strength: By improving your wrist strength, you can relieve pain associated with office work, release tension and enhance your grip strength. Colours: Choose between 3 different colours, red, blue, or black. Dimensions: 7cm x 5.5cm. Material: Made from zinc alloy, silicone, and polycarbonate. Wrist Exerciser: Get a gyroscope wrist strengthening exerciser ball today and be invincible! Gyroscope Wrist Strengthening Exerciser Ball | Living Social | Living Social