These are not Eschers but very fine Thuringians. By calling them Eschers Timber Frame Tools want to capitalize on Eschers' popularity.
Read this from their site:
and you'll see they know f**k all about Eschers. The honing particles of Eschers are garnets as everyone knows who owns an Escher and a mike and took time to look at the slurry under magnification.
Timber Frame World source their "Eschers" from MST:
http://www.mst-mueller.de/. Click "Neue Produkte". Nowhere on MST's site is Escher mentioned.
All Eschers are Thuringian hones but not all Thuringian hones are Eschers.