Maize-Ware was one of the last dinnerware patterns Stangl put into production in 1978, they year they closed their factory. It is a molded line, decorated in solid-color glazes. Interestingly, I don't see a reference to white as being one of the colors offered in this line, so these may have been samples.
They're the trivet or tea tile in this pattern.
Size: 7" in diameter.
Condition: some surface wear to the glaze, otherwise fine.
Mark: Stangl Maize-Ware backstamp.
Item ID: 4191