These are very well made, and very nice looking BUT the magnet is not strong enough. I do not have
a Leo Smetsers Chop cup, but have at least six others, and it did not work with any of them.
I also tried to attach the ball to a refrigerator, but the magnet was not strong enough; the
ball just rolled off.
SO, just make sure your chop cup has strong magnet(s), or you will be
returning it like I am.