Performer opens the lid of a small box and shows the inside of the box is completely occupied by six dice.
They are arranged with all the spots from one to six on top inside the box.
Performer covers the lid of the box and hands over another die to the spectator. A spectator throws this dice on top of the closed box. Presume the number thrown is four. 
He opens the box and Surprise ! All the four spots are now on top of the six dice inside the box.
And the spectators can examine the box and dice to their heart's content.
We supply you the plastic box with lid, all the required Dice, gimmicks and full instructions. You can repeat the effect with a different result.