They were talked about on So Yama-you know what's site a few years ago. Made in Japan, they were hard to find on this side of the pond back then. More expensive than the dia-sharp dmt. I heard they were better but never did buy one. Then they changed from a solid plate with the diamonds impregnated, like the dmt and the shapton, to a thin sheet with double faced tape to hold it on to a plate. Replace as needed. That kind of turned me off so I never did get one.