For many years, frozen dinners came packaged with a shaped aluminium foil cooking tray. This made them easy to reheat in a normal gas or electric stove's oven. The trays were sometimes reused or recycled by users. When microwave ovens became common, frozen dinners could not be cooked in them because the metal tray would damage the oven. Early packaged foods for the microwave often could not be cooked in a regular oven, because the heat would make the package catch fire or fall apart. New packaging had to be developed, so the same frozen dinner could be heated in both kinds of ovens. This succeeded during the 1980s. Some new trays can be reused, while others are made of paper and meant to be thrown away.