1. The binder size is 310*220mm. It is slightly larger than A4 paper. so it is not easy to get stuck when you insert the paper. better paper protection. The flap cover design is easy to use. 2.The folder is made of high quality kraft paper. sustainable. resistant. tear and moisture resistant. and can be used repeatedly. Lightweight materials provide everyday protection and comfortable wearability. 3.Suitable in the office. it allows you to store and classify important documents (contract. invoice. files. employee archives. plan and commercial project. bill of exchange. ect). Essential for school and teachers. examination of paper. student record. speech material. memory. etc. 4.These folders are ideal for everyday office workers and students who need to organize and classify lessons. which can help you find the information you need more easily. 5.Tip: Make sure your order is from Ibluelover. because we have never authorized any other seller. An IBLUELOVER exclusive. If you have any questions. do not hesitate to contact us. the satisfaction of our customers is our top priority.