Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_1307572_1 (composition VARCHAR, edge VARCHAR)
### Question:
What material is made with a rounded, plain edge?
### Answer:
SELECT composition FROM table_1307572_1 WHERE edge = "Rounded, plain"