Want an effective exercise tool when you have no time to work out? Keep your dexterity and strength intact when you can't make it to the rocks or gym thanks to the Powerball Gyroscope Grip Exerciser! A convenient & portable exercise tool to improve finger strength & forearm! Wrist ball features an extremely practical automatic starting function, just wind the rotor backward and，Small compact exercise machine you can take ANYWHERE，Pure mechanical wrist ball, no batteries or power source, environmentally friendly without electromagnetic radiation, military-grade plastic shell to protect your spinner gyro ball toy.
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