What is Cowry X?

[Sebenza4ever]

Sorry if this is stupid
What is Cowry X?
What is Cowry Y?
What is the difference between them?

How are they different from ZDP?

 

[Esav Benyamin]

Here's a previous thread on Cowry-X, which mentions all three of your steels.

I did a search on "Cowry" and got quite a few old threads. You might want to follow up on them, too.