This version of the Die Tunnel is made in Germany. Handmade quality product! The audience is allowed to look through a 1″ square tube (4.75 inches long), the tube it is empty. A 0.75″ die which just fits inside the tube is also handed out for inspection. The tube has a window on one side at each end so the die may be seen as it slides thru. The die is pushed through the tube with a small wand a few times thru the tube. The same spot number is seen in both windows as it slides thru. Now, snap your fingers, and when the die slides thru, the number on top of the die will change between one window and the other. Tube May Be Show Empty at ANY Time! No Shell or Duplicate Die to hide, only one regular die is used.