Kuhl - Plastic Nest Pads
After having a few broken eggs, despite mats and shavings in my egg boxes, I purchased these nest pads, along with the Plastic nest bottoms. No more broken eggs! The eggs also stay cleaner, and of course, my coop is not a mess of shavings (I use sand over a dirt floor).
And if I DO have a broken egg (I had an egg eater, but we've got that corrected), these nest pads are easy to clean and sanitize.