Please note: Naniwa has updated the name of this stone from the Chosera 400 to the Naniwa Chosera Pro 400 (sometimes spelled Chocera). The stone itself remains unchanged.
In the long-running discussion about top-tier water stones, the Naniwa Chosera Pro line consistently stands out for its combination of speed, durability, and excellent sharpening feedback. The Chosera Pro 400 is the coarsest stone in the Pro lineup and is purpose-built for rapid steel removal when serious work needs to be done.
This 400 grit stone is hard, fast cutting, and slow to dish, making it ideal for repairing damaged edges, removing chips, thinning knives behind the edge, and resetting bevels on very dull blades. Despite its aggressive nature, it offers excellent control and feedback, allowing skilled sharpeners to work efficiently without feeling harsh or unstable on the blade.
Like all Chosera Pro stones, the 400 is designed for splash-and-go use. A brief wetting of the surface is all that’s required; prolonged soaking is not recommended due to the resin-bonded composition of the stone.
Stone Size: 210mm x 70mm x 20mm
In the long-running discussion about top-tier water stones, the Naniwa Chosera Pro line consistently stands out for its combination of speed, durability, and excellent sharpening feedback. The Chosera Pro 400 is the coarsest stone in the Pro lineup and is purpose-built for rapid steel removal when serious work needs to be done.
This 400 grit stone is hard, fast cutting, and slow to dish, making it ideal for repairing damaged edges, removing chips, thinning knives behind the edge, and resetting bevels on very dull blades. Despite its aggressive nature, it offers excellent control and feedback, allowing skilled sharpeners to work efficiently without feeling harsh or unstable on the blade.
Like all Chosera Pro stones, the 400 is designed for splash-and-go use. A brief wetting of the surface is all that’s required; prolonged soaking is not recommended due to the resin-bonded composition of the stone.
Stone Size: 210mm x 70mm x 20mm
Reviews
14 review(s) WRITE A REVIEW (Reviews are subject to approval) Great first stone for bevels Nice addition to the setPosted By: Gordon Tillman - verified customer
10 people found this review helpful
I already had the 800 and 3000 grit stones from Naniwa and wanted something a bit coarser to help with thinning and establishing a new primary edge. This stone has been working great.
10 people found this review helpful
I already had the 800 and 3000 grit stones from Naniwa and wanted something a bit coarser to help with thinning and establishing a new primary edge. This stone has been working great.
Great Stone
Quick cutting, minimal soaking neededPosted By: Dave Conner - verified customer
7 people found this review helpful
Very happy, using this then bumping up to a 1k stone followed by the 2k green brick and finishing on the Richmond strop set up. 15-16 knives in and no cupping. Quick to make a fast cutting slurry, quick soak and cleanup in between knives. Super fast shipping, came well packaged and undamaged.
7 people found this review helpful
Very happy, using this then bumping up to a 1k stone followed by the 2k green brick and finishing on the Richmond strop set up. 15-16 knives in and no cupping. Quick to make a fast cutting slurry, quick soak and cleanup in between knives. Super fast shipping, came well packaged and undamaged.
Fast cutting stone Nice StonePosted By: Scott Walker - verified customer
6 people found this review helpful
I purchased this stone to use on very dull knives and damaged blades. The feel and feed back of this 400 grit stone is outstanding. I just finished setting the edge and sharpening a brand new inexpensive Chef's knife for my son. I was able to quickly create a burr with the 400, moved on to my Naniwa 800 and then to the Naniwa 3K. I was very pleased (and so was my son)with the quality and sharpness these three stone created on the blade edge. It was a pleasure to use.
6 people found this review helpful
I purchased this stone to use on very dull knives and damaged blades. The feel and feed back of this 400 grit stone is outstanding. I just finished setting the edge and sharpening a brand new inexpensive Chef's knife for my son. I was able to quickly create a burr with the 400, moved on to my Naniwa 800 and then to the Naniwa 3K. I was very pleased (and so was my son)with the quality and sharpness these three stone created on the blade edge. It was a pleasure to use.
Great StonePosted By: Scott Walker - verified customer
9 people found this review helpful
This is an excellent stone. It is very aggressive, but smooth, with good feedback. Because of this I only use it to repair damage to a blade or set an edge on a very dull blade. I can then move on to my Chosera 800 and then to the 3K. The combination of these three stones gives me an edge on my Chef Knives that is truly amazing.
9 people found this review helpful
This is an excellent stone. It is very aggressive, but smooth, with good feedback. Because of this I only use it to repair damage to a blade or set an edge on a very dull blade. I can then move on to my Chosera 800 and then to the 3K. The combination of these three stones gives me an edge on my Chef Knives that is truly amazing.
Wonderful product Positive Stone ReviewPosted By: Chef Mark - verified customer
10 people found this review helpful
See prior review on the naniwa/chosera 2000 grit. As noted, I saved up additional funds over the past month and purchased both the 400 and 800 grit chosera professional. Since I had already sharpened all my knives, I took 4 of my oldest paring knives and dulled the blades on the side of an old Arkansas stone. Starting from scratch, I progressed through the 400 to the 800 and finished on the 2000. After only a few minutes, I had obtained a shave-worthy edge on the paring knives with a mirror finish. Love the splash and go nature of the stones which transcends into an A+ rating on ease of use. Gave all three stones a resounding five star rating.
10 people found this review helpful
See prior review on the naniwa/chosera 2000 grit. As noted, I saved up additional funds over the past month and purchased both the 400 and 800 grit chosera professional. Since I had already sharpened all my knives, I took 4 of my oldest paring knives and dulled the blades on the side of an old Arkansas stone. Starting from scratch, I progressed through the 400 to the 800 and finished on the 2000. After only a few minutes, I had obtained a shave-worthy edge on the paring knives with a mirror finish. Love the splash and go nature of the stones which transcends into an A+ rating on ease of use. Gave all three stones a resounding five star rating.
cuts really good Product ReviewPosted By: Tom?s - verified customer
7 people found this review helpful
Bought this stone as a rough grit to a AS kohetsu. Tried it today, and i was impressed how fast it cuts and that the edge that it leaves is not rough at all! I read somethings, and this is a splash and go, so when you buy it, don't soak, it may crack. I recommend it for everyone.Greetings,Tom?s
7 people found this review helpful
Bought this stone as a rough grit to a AS kohetsu. Tried it today, and i was impressed how fast it cuts and that the edge that it leaves is not rough at all! I read somethings, and this is a splash and go, so when you buy it, don't soak, it may crack. I recommend it for everyone.Greetings,Tom?s
Product Review Product ReviewPosted By: Jon - verified customer
7 people found this review helpful
This stone is a beast. When I first got it, I set bevels and removed chips on over two dozen blades (mostly friends' neglected knives) before I began to notice the dishing. Very hard, cuts fast, dishes slowly. Excellent coarse grit stone, and feels smoother than 400 when you work with it.
7 people found this review helpful
This stone is a beast. When I first got it, I set bevels and removed chips on over two dozen blades (mostly friends' neglected knives) before I began to notice the dishing. Very hard, cuts fast, dishes slowly. Excellent coarse grit stone, and feels smoother than 400 when you work with it.
