Search query: power ball hand exerciser

Product: Summermax Wrist Power Gyroscopic Ball,Wrist Strengthener and Forearm Exerciser for Stronger Arm Fingers Wrist Bones and Muscle (Black Color) Make Arm Great Again. Strengthen fingers, wrists, hands, forearms, shoulders and bicep etc., and also be beneficial in promoting co-ordination and blood circulation.
This certainly requires some fine motor skills in order to use. The dominant hand/arm was easily able to keep the gyro ball going, that it will help refine your fine motor skills in that non-dominant hand/arm.
Small, compact and transportable, you can take anywhere. Simple to start with a pull-string.And the ball with flashing LED ，all you need do is to increase the speed by making a rotational wrist movement and to keep in sync with the spinning of the ball.
The unit did not have any weird vibration to it. Also having the silicone grip section is very nice as it helps with the gyro ball not coming loose from your hand. You can attach it to wrist strap, if you are really concerned about the gyro ball flying away.
100% with 30days Satisfaction Money Back Guarantee and 90 days quality warranty summermax Black

Product: NSD Power AutoStart Spinner Gyro Wrist Forearm Grip Strengthener with Auto Start Feature and Battery-Free LCD Counter Exercise Anywhere ¡X Compact, hand-held NSD Power Spinner spins at 15,000+ RPM up to 24.9 lb-in (or pounds-inch) of torque for an intense hand, wrist and forearm workout wherever you go
AutoStart Feature ¡X Features an internal pre-tensioner that allows you to start and stop exercising as you please; Just roll back the rotor in the direction of the arrow
Performance Digital LCD Counter ¡X Battery-Free and Self-powered Digital display keeps track of your workout info, including historical top speed and more to keep you ahead of the game; being functional when you reach 3,000 RPM
Designed to Last ¡X Built with an impact-resistant structure, including a military-grade plastic shell and reversible inner tracks for a long life
Easy to Use ¡X Easy even for beginners thanks to the battery-free design and intuitive AutoStart feature; Lightweight, portable and travel-friendly NSD Power Black