Upper material: Our report covers are made of non-toxic and waterproof polypropylene (PP), which is soft, durable, tear-resistant, moisture-proof, and resistant to deformation, allowing for long-term use. Size: The sliding bar binder measures 31 x 21 cm / 12.2 x 8.27 inches, a standard size for A4 paper and files. Value Pack: Includes 10 A4 report covers, with 2 pieces each of blue, yellow, white, green, and red, providing ample options for organizing and filing various documents. Easy to use: The transparent sliding bar binder allows quick identification of the first page without removing the document, offering better protection and easier access. Wide Application: Suitable for business, household, or student use. These A4 folders are ideal for price lists, product catalogs, drawings, proposals, menus, presentations, and general documents.