Automatic start (no cords required), just wind rotor backward 3 turns, release and spin for instant, fuss free starts every time;Drop resistant and computer balanced to exceed 18000rpm spin speeds with zero vibration powered just by your wrist (see video);Hand strengthener generates 0-16kg of inertial resistance, helping substantially increase forearm muscle size, wrist and grip strength - includes multi-function LCD speed meter;Highly beneficial grip strength trainer for golf, tennis, climbing, cycling, basketball, cricket, martial arts and with improved playing performance for pianists, drummers & guitarists;Efficiently rehabilitates wrist pain, humerus fracture, scaphoid fracture, radial head fracture, numbness in fingers, numb hands, fractured wrist, elbow tendonitis, broken bones, olecranon bursitis

• New NSD Power ball 280Hz Autostart Pro Hand grip Exerciser & Forearm Exerciser, Strengthens Forearm Muscles, Rehabilitates Wrist Pain and Wrist Fractures
• 280 Hz
• Smoked Black

New NSD Power ball 280Hz Autostart Pro Hand grip Exerciser & Forearm Exerciser, Strengthens Forearm Muscles, Rehabilitates Wrist Pain and Wrist FracturesPowerball