Cellophane noodles, or fensi, sometimes called glass noodles, are a type of transparent noodle made from starch and water. A stabilizer such as chitosan may also be used.
They are generally sold in dried form, soaked to reconstitute, then used in soups, stir-fried dishes, or spring rolls. They are called "cellophane noodles" or "glass noodles" because of their cellophane- or glass-like transparency when cooked. Cellophane noodles should not be confused with rice vermicelli, which are made from rice and are white in color rather than clear (after cooking in water).