Cannelloni usually refers to rectangular pasta sheets that are rolle with a filling. However, sometimes the pasta dough is replaced with a cooked crepe, generally 8-10 cm (3-4 inches) in length and once rolled, 2 cm (1 inch) in diameter. After cooking the crepe (or boiling the pasta), it is typically filled with a savory stuffing which may include ricotta cheese, spinach, and various meats. It is then covered with a sauce, typically classic tomato or bechamel sauce, although many variations exist. Cannelloni is often confused with manicotti, the major difference being that manicotti are preshaped tubes. In Italian, cannelloni literally means "large reeds" , while manicotti means "sleeve". Although both terms are plural nouns in Italian, the English term is often construed as singular, particularly when used as the name of the dish. The term manicotti is more common in the United States, so the two terms have been used interchangeably.