Powerball Supernova Classic. The ultimate exercise device, Powerball develops strength speed and dexterity in the fingers, arms, hands, shoulders and wrists. Also good for rehabilitation and therapy for broken wrists hands and arms. The extraordinary Powerball Supernova with its sapphire white and ice blue LEDs on a clear rotor revolving within a crystal clear shell is truly a design classic and will exceed the very highest expectations of Powerball fans all over the world once they experience its silky smooth movement!Put its rotor in motion and experience the stunning blend of sapphire white and icy blue LEDs which come alive as you spin and glow even brighter as the speed of the rotor builds... faster and faster... up to a point where it is thrashing and jerking furiously, literally exploding with inertia and almost impossible to control!Classic Powerballs come without counters, but you can always add a counter later if you subsequently decide you want to. Also included as standard are two starting cords and a mini DVD with instructions and videos.