(Effect)
A quarter coin is placed in a transparent round box.
The performer's hands are shown empty.
The magician removes the lid of the box and takes the coin out to show it to the audience.
Then the coin is returned into the box and the lid is fastened.
Afterwards, the performer shakes the box and the quarter coin visually changes to a 10 yen coin!
The box is opened and the 10 yen coin and the box are handed out to the audience for examination.
The lid can be examined as well.

(NOTE)
Comes complete with clear round box, gimmick and detailed instruction sheet in English and Japanese languages.