Hand Exercisers features: Wrist Ball Gyroscope Powerball Wrist Exerciser Power Strengthener Force Ball Gyro Athletic Wristball Hand Spinner With LED Speed| Power Wrists(Blue) Features: Effective Device Using a wrist exercise ball is the most effective and convenient device to increase muscles strength in your arm, wrist and hand. Wide Application A great exercise machine for musicians, typists and sports lovers, the Gyro Wrist Exercise Ball brings gentle and non-impact relief to Carpal Tunnel Syndrome, Repetitive Strain injury, tendinitis, arthritis and all wrist related ailments. Good for Your Fitness Just using the 250Hz Wrist Balls for 5 to 7 minutes a day is enough to make a big difference. Strengthen the Wrist Strengthening the muscles in your wrists, hand and arm will help your perform at your best. Portable and Lightweight The gyro wrist exercise ball is easy to carry around with you so you can use it in the office, on holiday and at the sports club as a warm up. Specifications: Type: Wrist Exercise Ball Material: ABS, Aluminum alloy Color: Blue Light Source: LED*4 Battery: Built-in Size: 7*7*5.7cm/2.75*2.75*2.24in Package: 1* Fitness Gyro 1* Rope 1* Instructions