Cazuelas, terra cotta dishes, have been used in Spain for literally thousands of years -- from the humblest home to the grandest manor house. Terra cotta is basic earth, low fired with an interior glaze.
A 4.5-inch diameter dish is a handy size to serve tapas such as olives, almonds, caper berries etc. Put an extra one beside the other dishes for olive pits or stems.
The glaze on the cazuelas contains no lead. It is safe for all cooking applications, although it must be presoaked in water if you are to use it on the stove. I prefer to be on the safe side and use them only in the oven. It is 1 inch deep.