CTB is a new version of coin through the card box.
The box can be shown from both sides and the viewer can see inside the box to see that it is totally empty.
It can be done with several small objects and the best part is that the box has the cellophane wrapped around it.
CTB is the perfect tool for this miracle, very clean, easy to do and you can carry it like a totally deck of cards.
This is CTB.