Naniwa Chosera Professional is an improved series of Naniwa stones. A magnesium bond material is applied in this series. The Naniwa stones provide such high performance because of the improved formula.
They do not require soaking
The wear is half comparing to the previous Naniwa series
Do not become salted during the working process
Naniwa Professional 3000 grit is designed for the basic sharpening and fitting of blades that do not require either a large metal removal or repair. The stone is supplied on a blank; it perfectly fits the TSPROF sharpener holder and others. They allow sharpening almost any steel with a hardness from 56HRC to 68HRC