fender91 wrote:what kind of tricks would you do with these
It's considered to be possibly the world's oldest magic effect, with some evidence that it was performed in ancient Egypt.
All sorts of vanishes, appearances, transpositions and other amazing magic are possible - using some sleight of hand. One of the better resources is Michael Ammar's "Complete Cups & Balls" book, which has details of several routines, including Dai Vernon's, as well as thoughts on how to construct new routines.