Fast & Effective - With this training ball you can train wrist and shoulders with short and effective exercises - even within a short break 6 in 1 - The training ball is perfect for training forearms, biceps, triceps, shoulders as well as wrists. It also strengthens the grip strength of the fingers Injury Prevention - Thanks to the efficient training, you will prevent carpal tunnel syndrome, RSI (repetitive strain injury), tennis elbow, golf elbow or tension in the arm, neck and shoulder Vibratin-free & Long-Lasing - Thanks to the precise rotation, no annoying vibration occurs during training. The stability and break-resistance of the gyroball is provided by the sturdy plastic housing and stainless steel axle Gyroscopic Training - The hand trainer by EVEREST FITNESS is one of the gyroscopic devices and stimulates the development of a good intramuscular coordination due to the rotational movement