Izoo® Automatic Power Ball | Auto Start Spinner Wrist Trainer Force Ball | Arm Strengthener Gyroscopic Wrist Forearm Exerciser for Strong Bones and Muscle | Making Fingers Biceps Triceps Great | Green, Yellow, Black

This uses a rubber within the ball to put it into motion instead of a string/dragging the ball into motion. The approach here makes it very easy for anyone to begin using this the way it's intended - strength and flexibility.This is a must have for anyone who spends a lot of time at the desk and may be suffering from hand/wrist flexibility issues like carpal tunnel.

Very nice product but not excellent. Make lot of noise while using. Similar to this product there are some silents are also available.

Good but I just spin it too fast and it broke😟

I do air pistol shooting. This is gonna be v helpful for my grip strength

It will help you to build your four arms. and pump it. easy to use.and it is value for money also.

The product was damaged within 1 month.Used it for few weeks.Looks like the spring is gone.Replacement policy us just 10 days.

Nice

It's a good product easy to use,build quality good helpful, value for money didn't needs battery runs automatically generated power.