Unlike here, the "GBC HiClear cover, 200 Micron, A4, super clear". Here agrees the quality and price.
For a price of about 14 cents you get a professional looking very good front foil.
They should, however, always punch alone, and not with the paper. Since the film is in fact also quite stable, the binding machine could otherwise be damaged.
Ideally suited for, calendar, application folders, portfolios, statistics, etc ...