Naniwa has replaced their Chosera series with the Professional series claiming they have improved the bonding of the stone. Is tat the reason, or did they had to cut expense?

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Product information:

Naniwa Professional

The Naniwa Professional-series is the improved version of the Naniwa Chosera Stones. Naniwa has renewed the binding agent of the water stones. It is unique that Naniwa itself takes care of the production of the binding agent. Optimal matching to the grit size is important. The result of this is that the sharpening properties of Naniwa water stones are significantly better than sharpening stones of other brands even though the grit size is comparable.

The Professional Stone is made on the basis of bound magnesium. This is a superior production method that ensures incredible sharpening properties. The PRofessional Stones barely absorb water so you only have to wet them after which you can immediately start the sharpening process. They do not have to be submerged. Once you finished the sharpening process it is important to dry the Professional Stones and to store them in a dry, dark place. This prevents the formation of small cracks.

About the grit size
Sharpening stones are delivered with several grit sizes. The larger the number, the finer the grit. The finer the grit, the sharper the sharpening result. You start the sharpening process with a coarse grit and then continue with a finer grit. Steps of a factor two to three between the different grit sizes are ideal.

Indication for the selection of the correct sharpening stone:
Grit 200 to 600: suitable for repairing the cut of blunt knives
Grit 800 to 1000: suitable for the sharpening of knives that are in a good condition
Grit 2000 to 3000: for a sharper sharpening result than the condition in which many new knives are delivered
Grit 5000 to 12000: for the sharpening of knives into a razor sharp condition
Specifications

Brand: Naniwa
Series: Professional (Naniwa)
Length: 21 cm
Width: 7 cm
Height: 2 cm
Length usable part: 21 cm
Width usable part: 7 cm
Height usable part: 2 cm
Weight: 745 grams
Use with water: yes, create wet surface before using
Abrasive: white aluminum oxide
cohesive agent: magnesium-bound
Colour: green
delivered as a set: no
Storage box / etui: no
delivered with stand: no
delivered with sharpening guides: no
Country of origin: Japan
Warranty on materials and manufacturing defects: 2 year

Naniwa Chosera:
Naniwa Chosera, Super and Work stones have been replaced by the new and improved Professional, Speciality and Combination stones. Click on the banner above for the new stones.



The Naniwa Chosera 400 whetstone uses magnesia as binder for the abrasive, in this case white aluminium oxide.

The Chosera stones do not soak up any water so the stones do not need to be sprinkled with water frequently. This makes Chosera stones rather easy to sharpen with. Because of their hardness you will not cut into the stone easily and sharpening with these stones will take less time. Their hardness make them a good choice for knives made from hard steel.

Splash with water before and during sharpening, do not soak or store in water.

Grit: 400
Measurements: 210 X 70 X 25 mm
Fixed on plastic baseplate with non-skid rubber feet


About grit sizes

Whetstones come in various grit sizes. The higher the number, the finer the grit. A finer grit results in a sharper knife. Sharpening a really dull knife on a fine grit will take much time, so you will need to treat it on a coarser grit first.

120 - 600: Appropriate when real dull knives need to be brought back in the right shape
800 - 1,000: Appropriate to sharpen knives that were already in a reasonable state
2,000 - 3,000: For a result sharper than most knives are when they leave the factory
5,000 - 12,000: To polish the knife and get a razor sharp edge
Remarks pertaining to Chosera sharpening stones

During manufacture, Chosera sharpening stones are bound with magnesium. This superior production method guarantees superb results. However, these magnesium-bound stones are more prone to developing hairline cracks. To prevent this from occurring, it is important NOT to use too much water when wetting Chosera sharpening stones. So Chosera stones should NEVER be left to soak in water for a prolonged period of time! It is also important to dry these stones thoroughly after use and store them in a dry, dark place.

Specifications

Brand: Naniwa
Grit according to supplier: 400
Series: Chosera
Length usable part: 21 cm
Width usable part: 7 cm
Height usable part: 2.5 cm
Use with water: yes, create wet surface before using
Abrasive: white aluminum oxide
cohesive agent: magnesium-bound
Colour: green
delivered as a set: no
Storage box / etui: no
delivered with stand: yes
delivered with sharpening guides: no
Country of origin: Japan
Warranty on materials and manufacturing defects: 2 year

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