Amazon.com: Hi5 PC Power Wrist Trainer Gyro Ball, Self-Starting Gyroscope Forearm Exerciser Powerball, with LED Lights, for Fitness and Forearm Force Workout, Arms/Fingers/Wrist Bones, and Muscle Training
LED Gyroscopic Powerball Autostart Range Gyro Power Wrist Arm Exercise Ball Toy | eBay
Gyroballs / Powerballs - Worth It? Or Bullshit? - YouTube