A4 paper files: transparent film pocket with perforation on one of the sides, designed to place sheets in folders-folders.
Plastic, most often transparent, stationery bag for storing and protecting paper documents from dirt and mechanical damage with perforation on one side for bonding. They can be combined in a folder by an arched or other mechanism.
Main sizes: A3, A4, A5, 12x12 cm, Letter. Most often used for A4 sizes.
Material: Plastic (including PP, PE)
Color: in most cases they are colorless, but modern materials allow the production of products in almost any color.