This is the very Famous Third Hand or Illusion Hand. You get a left and right hand. The gimmicks are made to resemble your hands. You can conceal your real hands as the audience believes the fake hands are yours. Spectacular

A bill or a currency note is borrowed from a spectator, folded, and dropped into a sealed clear crystal box through a slot on the top. Hand the box out to the spectator, and he will not be able to open the box unless he learns the clever secret. But you