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

【New Design】The convenient design can be carried anywhere, whether in the office, gym or at home, it can be used as a toy to decompress at any time, and it can also exercise arm muscles.
【Auto Start】with internal pre-tensioner, just roll back the rotor in the direction of the arrow on the rotor or against the internal resistance, when sufficient tension is achieved, just release and enjoy.
【 Shinning Lighting】Novelty design with LED lights, which is fun to see how fast you can get it spinning. Cool LED lights inside will light up while spinning, no battery needed, powered by rotating the wrist. Rehabilitates sore muscles, Kill the time & Add fun!
【Safe Protection for use】Skid-proof silicone loop and wrist rope design to prevent tossing out of the ball, double safe protection.
【More Suitable for Sports Training】 Wrist ball can promote blood circulation and increase the strength of fingers, wrists, hands, forearms, biceps, triceps and ligaments and shoulders, and restore muscle strength.