It's a mental magic that you can easily act.

 Place a small box of prophecies on the table.You are asked to choose one of the four different colored dice.For example, let's say you chose the red dice.The performer opens a box of prophecies and takes out a chain-shaped necklace from inside. ... Nantes! The necktie is equipped with a red dice as decoration!
 Brilliantly, the prophecy is right.Of course, I can show you that there is nothing left in the box.

Set contents: Toolset, Japanese manual