Roller ball is a ball-in-ball design.
The ball inside generates a centrifugal force.
Use your hands to master real controls to exercise wrist strength.
The user can make a corresponding swing as the inner ball rotates.
Adjust the inner ball rotation rhythm and speed as you swing.
The faster the speed, the greater the power.
Method is very simple.
Just pass the drawstring through the small hole on the inner ball.
Then quickly pull out the drawstring.
The inner ball in the middle of the roller ball will continue to rotate.
At this time, grasp the roller ball and make a corresponding swing.
You can exercise your arms, wrists, and fingers with it.
At the same time promote blood circulation.
Wrist training needs and people who want to strengthen palm power.
Basketball players who want to practice shooting.
Badminton, tennis, billiards players.
Wrist soreness caused by fitness training or frequent computer use.
Mechanical power, no electricity required.
Lightweight, easy to carry.
*In case of products out of stock, order takes 1 week approximately.