A waffle iron consists of two flat waffle-shaped plates and a connecting hinge. The most common type of waffle iron is the classic round cast iron waffle iron. Waffle irons are available in other materials, such as aluminium, Teflon, ceramic, or stainless steel. The material used in the waffle maker impacts its quality and affordability of it. Waffle irons are usually round or square to match the shape of the waffle.