Naniwa NK-2250 Professional Whetstone Kagayaki #5000 Sharpener with Storage Case 8.3 x 2.8 x 0.8 inches (210 x 70 x 20 mm)

I ordered the 5000 but I also have the Naniwa Superstone 8000 (they are the same) and I enjoy both stones a lot. I use them mainly for razor honing but they're all around excellent polishers. Some people are talking about load up which can be an "issue" for these stones but not exactly. The loading helps the stone polish more vs cutting more. If you dislike the loading the best thing to do is create a little bit of slurry with a diamond plate or something else, that slurry will keep the stone clean / free from loading.One issue I have is due to the dry climate I live in this stone and the superstone like to warp / move around when they're drying. I felt like I was going crazy because I was positive I flattened the stone before I put it away and the next time I use it its nowhere near flat anymore. I found a solution to that issue but Naniwa doesn't approve of my solution. These are resinoid stones, resinoid stones can be perma soaked (Naniwa says they cant but other stone manufacturers that make resinoid stones say they can). After some research I reached out to another manufacturer that produces resinoid stones and they told me, at my own risk, I could definitely get away with perma soaking these stones. The person stated they have Naniwa superstones as well and they've perma soaked them for years.I am now going on a year of having the stones soaking in water non stop and the stone hasn't started falling apart or anything, they do get a tiny bit softer but I enjoy it because they dont have as much of a plasticy feel to them. The issue with resinoid stones and soaking isn't the water itself its the drying. Being soaked in water doesn't hurt the stones but when you take a resinoid stone that is wet and dry it out, the stone dries at an uneven rate due to the makeup of the stone itself. This uneven drying is what was causing the warping problem I faced but it can also cause the stone to start cracking / crazing and eventually fall apart if the stone was soaked or it was wet for a really long session of polishing.So in short, if you have an issue with these stones not staying flat you can perma soak them if you have space for that. If you ever need to dry them out after soaking for a long time then make sure you dry them very very slowly such as putting a wet paper towel around them and placing them in a plastic bag that has a small opening so you can control the rate of drying.Overall, these are some of the best razor honing stones money can buy imo.

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