Usually, it is made of metal foil, but sometimes of plastic.

Hhokga came back with a very thin piece of metal foil and spread it out on the table.

The metal foil is the material from which the circuit paths are normally etched.

Each is layered with a thin metal foil, usually aluminum, as the electrodes.

Flexible batteries can be made by printing onto plastic, thin metal foil, or paper.

The mirrors can be made of ceramic or metal foil.

Two metal foils are separated by a layer of paper or polyester film.

It resembled nothing so much as a paper dart about twenty feet long made of thin but tough metal foil.

The readings were inscribed by needles on rolls of metal foil.

Tom pointed to a bale of metal foil which he had brought along with the machine parts.