These are very well made, but the "device" is a bit weak. I sort of collect chop cups (and cups and
balls). C'mon, we all know you all do....
Anyway, they would not work properly with most
of my chop cups and and I was preparing to return them. then I found a leather/unfolding one I use
when traveling, and they work perfectly.
Just be careful. AFTER I bought it, Penguin
told me they really only work with Leo Smesters chop cups. Really. They could have put that on the
product description, either as warning or suggestion.