This is probably one of the best ways to start a sponge ball or cups & balls routine.
I've
seen people complaining on message board about no "user guide", but there is an example in "25
Tricks with Cups and Balls" video.
It is a little small, but I guess you wouldn't be able
to hold it otherwise.
Other than that, it does the job and, as I said before, it's great to
produce balls and coins from "nowhere"