What material is made with a rounded, plain edge?
CREATE TABLE table_1307572_1 (composition VARCHAR, edge VARCHAR)
SELECT composition FROM table_1307572_1 WHERE edge = "Rounded, plain"
### 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"