Belgian whetstones are used for sharpening the knives. The Belgian whetstone no. 4 is the smaller one of Otter whetstones and no. 6 is the bigger one.
The lighter layer is used for grinding, the slate layer on the bottom is simply to make the sharpening stone stronger. The Belgian whetstones must be wet before honing. Set the blade onto the stone at a sharp angle and pull it back in circular motions. A natural abrasive paste develops in this process, which sharpens the blade and polishes it finely at the same time.
These whetstones consist of natural stone, quarried from the Belgian Ardennes mountains. Their unique consistency makes it possible to grind the blades with precision and in a material-friendly way. Each whetstone is a different shape and it is delivered with white Otter fabric bag.