Here's a different penetration trick!
We only have this one- so if you want it, better grab it!
Start with a square wooden tube, a small wood sword and a steel ball.
The tube is ordinary except for two slots thru which the sword can be inserted, thus blocking items from passing thru the tube.
The audience is allowed to look thru the tube and when the ball is dropped thru the tube it falls thru as expected.
The sword is then inserted and the audience can see that it blocks most of the inside, leaving no room for the ball to pass thru again.
Yet, that is exactly what happens when the ball is dropped into the top-
it passes straight thru the sword!
The tube is made of wood. Size is about 5.5" high and 1.5" on each side. Small sword is made of wood. Ball is made of metal.
CONDITION: gently used