With this useful gimmick you can not only fool the wise guy that knows the plastic fingers, but you will also fool your magic friends. With this you can perform many of your thumb tip effects but you finish ABSOLUTLY CLEAN!
Imagine this only as example:
You show the hands empty
Take a strip of paper and tear it very slowly in many pieces
You put all pieces in your fist and magically the strip is restored
But listen...you give the strip for examination and your hands are empty, no thumb tips, no anything!