1. Never put them in the dishwasher.
2. Don't let them soak overnight.
3. Hand-wash with water and dish soap right after using.
4. Always wipe-off the excess moisture after washing.
5. Let them thoroughly air-dry before storing
6. Routinely treat with beeswax or oils.
A V-shaped set of mortar and pestle. Works great for grinding and crushing ingredients.