There are quite some methods (and gimmicks) to do this trick. I believe it is one of the best! Ok,
palming is not that easy with it and needs some practice (steals one stars; Guess the shape could be
a bit improved) But, as magician you should be used to some palming. To make a long story short: I
succeeded to even fool colleagues with it. Especially the tweezers idea makes it incredibly
convincing and even easier perform if you found out how to hold it.
So, I always have it in my
pocket to be ready for a micro illusion with short sleeves, fully examinable.
Its costly
though, but most of magic trick prices do not reflect material cost!