Vintage French sandstone mustard pots with a brown glaze.
 
These were traditionally made and used to store mustard or pickles with a cork lid. 
They’re lovely and tactile. 
They can be used to store food if a suitable cork lid is acquired. They also make lovely small vases or utensil holders. 
They measure approx. 15cm tall
I have four of this style but one has a chip on the bottom rim and is being sold a little cheaper