Your choice is our honor The gyro ball wrist exerciser is your best exercise partner for enhance muscles of the hands, wrists & forearms product details Auto-Start Design Push metal core as arrow, gyro ball wrist exerciser starts with the internal spring and wrist motion. LED lights change with rotation, making it a magical torqueball that can bring you happiness, stress relief & good for health Level Color-Shifting Challenge The wrist core matches LED colors to wristball's core speed: Blue, Green, Red, Purple, Cyan. You can enjoy the challenge Portable & Versatile The gyro ball metal with a moderate size and weight, and a convenient carrying case, you can easily exercise and relieve stress anytime, anywhere – whether it's in the office, gym, at home, or during travel We hope our product can bring you a pleasant experience. If you have any questions, please feel free to contact us at any time Auto-Start Design: Push metal core as arrow, gyro ball wrist exerciser starts with the internal spring and wrist motion. LED lights change with rotation, making it a magical torqueball that can bring you happiness, stress relief & good for health 5-Level Color-Shifting Challenge: The wrist ball's core matches LED colors to wristball's core speed: Blue, Green, Red, Purple, Cyan. The gyroscope wrist exerciser can train wrist strength, and bring you the joy of competitive challenges Excellent Quality:The gyro ball wrist exerciser forearm strengthener features a full-metal shell, non-slip silicone grip, anti-slip wrist strap design. Powered purely by mechanical driving without electricity, it ensures stability, control, durability, & longevity Pocket-Sized Power: Slip the compact gyro ball wrist exerciser in your bag. Office warriors combat keyboard fatigue, musicians sharpen finger agility, travelers maintain arm tone – gym-free fitness made simple Strengthen Wrists & Hands: The wrist gyro ball targets joints, ligaments, and muscles of the hands, wrists & forearms,perfect selection for office workers, students, tennis trainer,bowling ball exerciser and badminton trainer