I've seen one of these before on a leather case...As you know, they're designed to protect the leather on a case from the bumps and grinds that come when traveling.
I have a gun case that's in great shape and would like to keep it that way, even though I would likely use a hard plastic case that I have in most travel situations.
Here's an example of what I'm talking about. I would think there might be a good source for others that I could consider.
Thanks!

[Linked Image from jeffsoutfitters.com]