The quality is stable, the polished surface is also good and good. Reduction is somewhat quicker if you give it as the only difficulty. The limit comes from 2 to 30% faster than MonotaRO-like discs. Actually I wanted to use MonotaRO like something cheap and good, but happened to break five at the same time with rotation as it rotates and taste the five fears that the big deal is on the verge. . . I am afraid to use it anymore, I changed to this disk. (However, it may be safe now just because there was a defective adhesion in that lot happened by chance.) There is not such a thing at all on this disc. I will continue to buy this in the future.