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.

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.

This is the second consecutive time I’ve ordered whetstones through Amazon and have received broken merchandise. These are whetstones and are breakable if mishandled. Stuffed in an envelope, shipped to the other side of the planet with NO padding, support nor proper packaging. I am NOT in the habit of throwing my hard-earned money at damaged goods. Won’t do it. This one is going right back too. As much as I don’t want to I guess I’ll have to check on another site. They’ll cost more but maybe I’ll get my orders in good/proper condition. Never know til I try. Beware of Amazon Japan and Fun Fun Hobby Japan. I use these stones on a regular basis. Can’t/won’t use them damaged. They’re not cheap either. $75.00 for just one whetstone. Ridiculous. I build crating for very large machinery that goes up to and well over $125,000 and have NEVER had a complaint. This is just lazy and derelict in what I know is established packaging procedures. I am not pleased and will be talking to Amazon.

これまでキングのS1#6000を最終仕上げに使っていましたが、どうも番手通りには余り細かい刃が付かないようで、S1の後にこの#10000で仕上げると良い刃が付くようになり、40°の小刃でYouTubeで見るような筒状のコピー用紙の袈裟斬りが出来るようになりました。 注意点としては、それなりに給水が必要な砥石でしたので、使用後の乾燥の仕方によっては将来ヒビが入ったりするかもしれません。 また、ただの相性の問題かもしれませんが、面直しのために#1000の焼結砥と友擦りした所、#120の荒砥石で引っ掻いたかのように荒れてしまったので注意して下さい。 それと、使用に差し支え無い程度ですが、砥石の角が1箇所欠けていました。 商品はプラケース入りとは言え、紙袋に直入れの梱包方法に難ありです。

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

製品としては申し分ない砥石ですが、研いでいると研面の水がすぐになくなってしまいますので、やはり少し水に浸けてから使う方がいいと思います。