Bill Vanishing Tube

A spectator is asked to sign a dollar bill and place to within a brass tube. He remains possession of the tube throughout the effect. Magician never touches the tube once the bill is sealed. Upon spectator opening the tube, he finds that the bill has vanished. It is immediately found within our bill tube.
Box Dimensions (in Inches)
Length : 8.00
Width : 4.10
Height : 2.10