Spaghetti is a long, thin, solid, cylindrical pasta. It serves as a staple food of Italian cuisine and is made of milled wheat and water, with the standard Italian version using durum-wheat semolina. The pasta is usually white because refined flour is used, but whole wheat flour may be added. Spaghettoni is a thicker form of spaghetti, while spaghettini is a thinner form. Capellini is a very thin spaghetti, while vermicelli is intermediate.