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Most prong folders are made from plastic—commonly polypropylene—and use metal for the prongs or fasteners.
They typically feature two interior pockets and use metal pronged fasteners; some listings note three gold prongs for 3-hole paper.
Sheet capacity varies by model, from about 25 sheets on the lower end up to around 200 sheets for higher-capacity prong folders.
Listings describe metal prongs or metal clasps designed to secure 3-hole punched paper; a few specify three gold prongs.
Reviewers generally describe them as sturdy and water-resistant, durable enough for regular classroom use and lasting through a school year.