I am writing this review in good faith with my order. My previous order seems to be still on its way, when I contacted A-STYLE JAPAN I informed them that I understand the shipping process from international countries, along with China's current Covid19 shipping policy, package delays may have changed. But the response was exceptional, they offered to resend or return my product although I expected the remaining shipping to take about a week. Understanding how long this takes, not only did I have full confidence in the Japanese A-style brand, but I also ordered a higher quality stone to go with it. These stones have the perfect concave convex curves for my curved blade and also for my wife's curved grooming scissors. I can't wait to have these stones just for my Spyderco. I used a $100 Spyderco knife sharpener that takes way too long to sharpen. I tried the Laskey sharpening system on my blade. Neither produced an edge after more than an hour of sharpening. But even 5 minutes with professional sharpeners of this kind didn't result in what I needed. That's why I decided to order these stones. While I don't have much time left to use one of these stones, I would definitely recommend it to anyone who has a curved blade and is having trouble getting it to apex.