Show a clear acrylic cylinder, with three balls in it, ( two yellow balls, with a red ball in the middle).
Both yellow balls are dropped into the clear cylinder,
which is covered with another silver cylinder just big enough to fit around the crystal one.
The red ball is genuinely placed in the performer's pocket.
With a magic pass the ball is transferred invisibly, from the pocket to the cylinder.
When the silver cylinder is lifted off the clear one, the red ball re-appears between the two yellow ones.
Once again the crystal cylinder with the ball can be given for examination,
and the silver cylinder and pocket shown to be empty.
Clear acrylic tube is 5.5" high, and 2" in diameter.
Silver tube is stainless steel, and large enough to just fit over the acrylic tube.