Power Wrist (Powerball/Wrist Ball) This device allows you to exercise your wrist and arm muscles by rotating the ball inside the main body and utilizing centrifugal force. Recommended for grip strength improvement, forearm muscle training, rehabilitation, stress relief, and more! How to use: Insert the tip of the string into the hole of the rotating ball and wind the string along the groove of the rotating ball. Pull the string vigorously to give the rotating ball a vertical spin. Immediately turn the part where the rotating ball is coming out downwards and, before the rotating ball stops, rotate your wrist and forearm in a circular motion to give the rotating ball a horizontal spin. When the rotation gains momentum, it will make a "woong woong" sound and become heavier. Tips: The vertical spin immediately after pulling the string will stop in about 10 seconds if left alone, so imagine adding a horizontal spin during those 10 seconds to help maintain the vertical spin's momentum. If the rotation gets on track, the synergistic effect of vertical and horizontal spins will make it spin faster and faster! Enjoy grip strength training like playing a game!! Although it is a new, unused item, it has been stored at home, so there may be some unnoticed minor scratches or stains. Please refrain from purchasing if you are concerned about such details. We are looking forward to your purchase if you understand. (☝︎ ՞ਊ ՞)☝︎ Price reduced again Shipped via Mercari delivery service with anonymous shipping. ※ To prevent troubles and swapping, we firmly refuse returns, including those due to color differences. We do not accept returns or refunds under any circumstances. Please understand this beforehand. The price includes shipping costs. We will carefully package and ship promptly. Thank you very much! Management number: 0923-1301 #Spinner #Powerball #Wristball #GripStrength #ArmStrength #Wrist #TrainingEquipment #Toy #PowerWrist #MuscleStrengthening #TrainingGoods #ExerciseEquipment #Aussie #Joinus #HandGrip #Forearm #Exercise