Material: kraft paper+ metal ring,environmental recycled material,simple and generous,it is not easy to be damaged.Their plain, papery exterior makes them ideal for students to decorate during the back to school season or for professionals seeking a simple appearance. Size:1 7.5X2 3.5cmsuit for A5 size notebook.Strong and tough, ideal cover for DIY journal book,notebook,diary and etc. There are 6-hole round ring in the kraft paper binder,the round rings can be opened and closed easily when you need to add or remove pages and hold pages securely. You can remove any pages that you don't want with very little mess. Plus, instead of having to throw out a whole book at the end of the year, you can just recycle the inner pages Protect,store and organize notes, projects, important documents and more.Perfect school and office stationery gift for students and teachers, businessman and businesswomen etc.