All Metal Power Wrist Gyro Ball AUTO Start Wrist Exercises Weighted Solid Gyroscope Ball Forearm Exerciser Arm Strengthener for Strengthening Joint and Muscle
Heavyweight ZINC rotor provides 50 lbs torque at 10,000 RPM. Ideal for building muscle and grip strength for professional and amateur athletes alike
Solid mental gyro ball, It weighs twice as much as thoses plastic one.
Small, compact exercise machine you can take ANYWHERE
Pure mechanical wrist ball, no batteries or powersource, environmentally friendly without electromagnetic radiation, military-grade plastic shell to protect your spinner gyro ball toy
AUTO START, NO STRING NEEDED! with internal pre-tensioner, incredible high speed up to 20,000 rotational speed per minute pass through testing