You first throw them to show random numbers, then demonstrate how a magician can get them to throw Lucky 7 with every throw. You can use the dice for mental effects, and predict the numbers rolled by a spectator.
You would demonstrate the dice throw random numbers then place a prediction on the table, and hand them the dice in a bowl to roll, while they concentrate on the prediction. When prediction is opened it displays two squares with the 1 and 6 spots.
You can use these for a number force, or several other applications, as detailed in our instructions.