led power wrists ball trainer gym fitness equipment streng train gyroscope power ball arm exerciser ball machine exercise y200506

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 da...