Doughnuts are usually deep fried from a flour dough, and typically either ring-shaped or a number of shapes without a hole, and often filled, but may also be ball-shaped ("doughnut holes"). Other types of batters may also be used, and various toppings and flavorings are used for different types, such as sugar, chocolate, or maple glazing. Doughnuts can also include water, leavening, eggs, milk, sugar, oil, shortening, and natural or artificial flavors.