Wrist Trainer Arm Strength Training Wrist Forearm Strengtheners Gyroscopic of Force Ball

• Strengthen fingers, wrists, hands, shoulders, forearms, triceps, ligament and biceps etc., beneficial grip strength trainer for golf, tennis, climbing, basketball etc..
• Beneficial in promoting co-ordination and blood circulation, great for musicians, guitarists, pianists, drummers etc., and also be rehabilitates sore muscles and joint.
• Small, compact and transportable, you can take anywhere. Simple to start with a pull-string.
• Cool LED lights inside will light up while spinning, no battery needed, powered by rotating the wrist, 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 faster you spin the harder your muscles work.