The NSD Powerball Hand Exerciser is a therapy tool for treating the hand and wrist.
It uses gyroscopic inertia to gently train the hand and wrist.
The user is simply required to spin the Powerball in their hand for 5-7 minutes per day.
An innovative design means that the resistance only increases when the ball is spun faster.
This allows the user to easily control how hard they are working.
The NSD Powerball Hand Exerciser can treat tendonitis, tennis elbow, strains, arthritis and carpal tunnel syndrome.
A speedometer displays the speed at which the ball is working.