Description: 【High Quality Material】Wrist Gyro Ball is made of high quality PC and silicone material, featuring high durability, strong enough for heavy duty exercise. 【Olive Wrist Ball】The wrist ball is exercise the wrist, it can be adjusted at will. The faster the ball core rotates, the greater the power will be. 【Ergonomic Grip Design】The Wrist Ball is ergonomic and easily used. comfortable grip. Automatically start the design, easy to use. 【Function】The forearm strengthener is great for wrist & forearm training, building up wrist strength. A great gift for family and friends. 【Size】22cmx7.5cm/8.66inchx2.95inch, with a compact and portable design, take this grip strength training with you and exercise anywhere: at home, workplace, or travel. Specification: Material: PC, Silicone Size Chart: 22cmx7.5cm/8.66inchx2.95inch Package Includes: 1 Wrist Gyro Ball 1 Manual Note: Please allow slightly errors due to manual measurement and different monitors.