Some instant liquid soups are manufactured in microwaveable containers. Now, most frozen food trays are made of a microwaveable and disposable material, usually plastic. Heating sources can include warm water, microwaveable pads, wheat packs and electrical or chemical pads. It can also be used in microwaveable heat-retaining slippers and pillows. In 2007, Veetee launched its range of microwaveable rice, at the time called Dine In.