Upper material: Our zipper binder folders are made of non-toxic and waterproof polypropylene (PP) material, soft and durable, tear resistant, not easy to break, can use them for a long time. . Cut: The report cover size is 31 x 21 cm / 12.2 x 8.27 inch, general size for A4 size paper and files. . Value Pack: Comes with 10 A4 sliding bar files, available in five colors (blue, yellow, white, green, red), two pieces for each color, enough for you to collect and file different documents. . Easy to use: The sliding bar binder is transparent, the document does not need to come out and can read the first page, better protect the document, easily find the document you want Thumb notch for easy opening. . Wide application: Ideal for business, household or student The cover of our folders is A4 size, can be used as tax folder, sheet music folder, homework folder, presentation folder can be applied in price list, catalog of products, drawings, proposal, menu, presentation, documents, etc. .