Made in Japan.
There is a reason Naniwa chose Pink Aluminum Oxide for this flattening stone. Most flattening stones are made with Silicon Carbide, which is a very jagged particle that cuts aggressively, but which is also brittle and breaks down quickly. Pink Alumina doesn't break down as quickly as Silicon Carbide, but still maintains a good aggressive cutting speed. This combination of cutting speed and durability, results in a hard wearing flattening stone that retains its shape well.
Soak the flattening stone before use, and soak or wet the water stone as appropriate. Place the water stone on your work surface or hold it in your hand and then rub the Naniwa Flattening Stone over it until the water stone is perfectly flat.
Size: 210x55x25 mm