ナニワ研磨工業 Naniwa Kogyo NA-100 Goken New Super Finishing Whetstone for Professionals #10000, 8.3 x 2.8 x 0.6 inches (210 x 70 x 15 mm)

The product arrived damaged, but after some effort, Amazon resolved the issue. The whetstone itself is excellent, and I have no complaints about it.

Other customers have reported broken stones and boxes. My box was cracked and within an hour a piece of it came off. The stone itself was fine except for a very small chip that I smoothed out.

Nunca falla naniwa, la calidad de esta piedra esta fuera de toda duda es muy buena además viene en su caja de plástico que sirve como soporte.

Pour finition couteaux damas le top

I purchased this stone to complete the full range of the Naniwa Chosera series. Some sharpening enthusiasts mention that the Naniwa Gouken Arata series is a lighter version of the Naniwa Chosera with the same formulation, so I decided to try the Gouken Arata #10000. I’ve been using the Naniwa Chosera line for quite some time, and the highest grit I own in this series is the #5000. The Chosera stones have never disappointed me in any of their versions. As for the Gouken Arata #10000, I’ve tested it a couple of times with a Tojiro Damascus knife and another made of AUS8 steel, but I didn’t notice a significant improvement in sharpness when moving from the Chosera #5000 to the Gouken Arata #10000. The Gouken Arata #10000 feels a bit hard and dry, even after soaking it in water for quite a while. The sharpening experience is quite different from the Naniwa Chosera line, which makes me doubt whether the Gouken Arata really shares the same formulation. Perhaps I need to test the Gouken Arata #10000 with other steels to form a more conclusive opinion. However, for now, I’m giving it 4 stars, since the sharpening feel and final edge quality are not quite what one would expect from a Naniwa stone rated at #10000 grit.