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. .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. .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. .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. .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. .