Want to build significant power and strength into your wrist, forearms and shoulders? No problem! The Powerball 250Hz Pro is the ideal device to gently repair lower forearm and wrist joints affected by carpal tunnel syndrome, repetitive strain injury and arthritis.
The Powerball 250Hz Pro features a finely engineered and precision crafted gyro, consisting of a rapidly spinning rotor enclosed in a solid outer sphere. It spins faster and faster until you reach an unbelievable 15,000rpm at which point itâ€™s exerting almost 40lbs of pressure on your limbs with no batteries, no motor but just a pure gyroscopic power.
– Â£16.95 at gizoo