1. The binder size is 310*220mm. It is slightly larger than A4 paper, making it easier to insert documents without damage, providing better paper protection. The flap cover design is convenient and easy to use. 2. The folder is made of high-quality kraft paper, which is durable, strong, tear-resistant, and moisture-resistant, allowing for repeated use. Lightweight materials offer everyday protection and ease of handling. 3. Suitable for office use, it allows you to store and organize important documents such as contracts, invoices, files, employee records, business plans, projects, and bills. Also ideal for school and classroom use, including exam papers, student records, presentation materials, and theses. 4. These folders are ideal for everyday use by office workers and students who need to organize and categorize documents, helping you locate the information you need quickly and efficiently. 5. Tip: Ensure your order is from Ibluelover, as we have not authorized any other sellers. This is an Ibluelover exclusive. If you have any questions, please customer satisfaction is our top priority.