wrist gyro ball, wrist booster and forearmexerciser for bones and muscles of the armsand wrists with led lights. xiyuan wrist wrist ball<br /> <br /> <br /> extend your arm, the bare part is facing up, grab the remaining rope and pull it up quickly. if the operation is correct, the ball will start to rotate. hold the wrist ball with your favorite hand and start rotating your hand and wrist while trying to keep your arm steady to help speed up the gyroscope until the desired speed is reached. continue to use until it is completed.<br /> <br /> it's fun, it's suitable for hands, wrists, shoulders, forearms, biceps, warm-up exercises, then climbing, golf, basketball, etc.<br /> also, if you use your computer for a long time or play the piano, you can play for 15 to 20 minutes a day, and you will feel that your hands are not so painful.<br /> <br /> powerball ball toy hand grip enhancer; hand exerciser; relieve stress - anti-stress and anxiety, with led lights, children, teenagers, students and adults<br /> <br /> <br />