"See this stuff?" Cuban said on the video, grabbing the display. "It was a scam when they were on 'Shark Tank.' It's still a scam. I don't care if the NBA was dumb enough to sign an agreement; this is going where it belongs."
At that point, Cuban put the display case in a trash can.
Power Balance bracelets have supposedly magic holograms that make you more nimble, have greater flexibility and have less fatigue. They are in fact, completely fake and have been proven many times. Even by the maker of the bands.
Richard Saunders of Australian Skeptics demonstrates how the scam works in this video.