Naniwa Whetstone #5000 Professional Stone P-350

The Naniwa Professional 5000 sharpening stone features an ultra-fine grit size that ensures your knives achieve razor-sharp precision.

- Grit: 5000 - Japanese water stone - Dimensions: 210 x 70 x 20 mm - Material: White aluminum oxide - Manufactured at the NANIWA factory in Osaka, Japan

Naniwa Professional Stone Series This is Naniwa's highest-quality sharpening stone. There are ordinary sharpening stones—and then there are those that become your most treasured possessions. The Naniwa Professional is one such product. An experienced user looks for a stone that not only sharpens well but also sharpens quickly. The Professional series is so consistent and fast that using it is genuinely enjoyable.

The dimensions are 210 x 70 x 20 mm—almost perfect for most knives and tools. The thickness of this single-sided stone will last through countless sharpening sessions.

Magnesia Bonding What sets the Professional series apart from other water stones is the bonding agent between the abrasive grains. Known as Magnesia Bonding—compared to the resin used in the Naniwa Super Stone series—this process results in higher grain density and consistency. This gives the stone the fastest sharpening ability among all Naniwa series. Experienced users will truly feel the difference.

Soaking the Professional series stones is optional. If you choose to do so, we recommend no more than 15 minutes. After that, your stone is ready for use. Keep a spray bottle handy to keep the surface moist during sharpening.

Stone Care Naniwa Professional stones require more care than your average stone. Unlike some water stones, these should not be left soaking in water, as this can affect the bonding. After use, let the stone air-dry naturally. Do not try to accelerate the drying process with heat—just leave it to dry evenly. Store the stone only once it is completely dry.