Upper material: Our report covers are made of non-toxic and waterproof polypropylene (PP), which is soft and durable, tear-resistant, moisture-proof, anti-deformation, can use them for a long time.<br> Size: The size of the sliding bar binder is 31 x 21 cm / 12.2 x 8.27 inch, general size for A4 size paper and files.<br> Value Pack: Comes with 10 A4 report covers, each color (blue, yellow, white, green, red) for 2 pieces, enough for you to collect and file different documents.<br> 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.<br> Wide Application: Ideal for business, household or student Our folders cover A4 size files, can be applied in price list, product catalog, drawings, proposal, menu, presentation, documents, etc. .