This item has been designed and produced in Tora Magic Company.
And it's an amazing item!
The magician shows an empty Crystal Cube to the audience.
Then instantly the crystal cube changes to a Rubik cube.
Then the magician puts the Rubik cube in an empty box.
And then the Rubik cube changes to a white dice.
At the end of show; the magician can show the empty box and dice to the audience.