Do not buy this Gadget. It can break your fingers or tear your muscle . Look at the speed and the vibration of his body.

wrist strap. i mean look at tarik tali game. i saw in the internet the arm of the contender was pullout from the incident.

With the wrist strap somemore keeping your arm and the powerball together.

my advise is just to cautious the public of this sport because some people may try to break the record but end up some freak accident later.

Even that guy felt the pain in you tube and he was shouting too, the vibration shook his arm and i notice the twisting of it that cause him to shout.