1x Gyro ball. The maximum possible rotation speed exceeds 12,000 rpm, which can generate resistance of up to 32kg. If you want to improve your wrist,
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OHITEC Auto Start Wrist Power Gyro Ball, Wrist Trainer Ball Hand Strengthener Wrist Exerciser with LED Lights for Fitness and Forearm Force Workout, Arms/Fingers/Wrist Bones/Muscle Training : : Sports, Fitness & Outdoors
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LED Gyroscopic Powerball Autostart Range Gyro Power Wrist Ball Arm Hand Muscle Force Trainer Fitness Equipment