This is the world famous deck of playing cards that has been seen in movies, on TV and in shows all over the world. With no practice at all, you can have the cards cascade from one hand to the other like a waterfall. It can be used in shows where actors need to look like card sharks, or by magicians.
This is a specially prepared pack of cards which are all strung together and which allows you to perform fancy card flourishes, with much greater ease and far less practice, than if performed with a normal pack. It allows you to give the impression of possessing much greater skill than you really have.
Also can be used for comedy purposes, like the frozen waterfall, or the hanging card selection.