What materials did the Philips company use to make a cassette?

Philips primarily used plastic to create the outer casing of cassette tapes, typically polycarbonate or ABS (acrylonitrile butadiene styrene). The magnetic tape inside was made from a thin plastic film coated with a magnetic material, such as iron oxide or chromium dioxide. Additionally, metal components were used for the tape's spools and other internal mechanisms.