Easy To Use - This auto-start wrist trainer power ball adopts the Gyro rotation kernel, it needn't rope to start. Wrist Fingers Training - This wrist Gyro strengther ball can exercise your wrist hand and training your finger bones forearm phalanges. High-Quality Long Time Using - shell is made of hard plastic material and is very durable. There is also a non-slip silicone ring on the outside of the shell to keep safe using. Lower Noise: Metal movement, stable rotation, smooth experience, low noise Carry Anywhere: The small wrist ball allow you to take and exercise Anytime Anywhere; Provides up to 134 lb-in of torque at 20,000 RPM
