Natural whetstone from the French Pyrenees.
Directions for use: this stone can be used dry, but also with water for a better contact. Simply soak the stone for 10 minutes in water, then use it.
As this is a natural stone, there is no defined grain size.
This stone does not require any special maintenance. If necessary, you can clean the stone with a washing-up liquid after a certain period of use by brushing it under hot water.