Expanding files provide durable protection for the files stored inside, in addition to keeping paperwork organized. The holders are compact, secure and can expand to store large, growing files. These files are made from acid-free polypropylene which contains an additional additive. Visit attributes.c-lineproducts.com to learn about the environmental attributes of this product. Organize documents by sorting pages among the dividers. Use the tabs to identify where information is stored. Secure closure keeps documents inside holder during storage and transport.