The Body System Wrist Strengthener helps you develop your muscles to prepare for various sports. With 5 Tension Levels (to set the levels, rotate the red ring to find the right level) The Body System Wrist Strengthener has a soft resting spot for your elbow’s comfort, has 4 different size adjustments also work on forearm and can help eliminate pains. Repeat steps to train up your hand / wrist / forearm.