Colour Blue Material Stainless Steel, Plastic, Metal Sheet size A5 High-quality materials: waterproof plastic material, strong round stainless steel ring binder, large capacity, sturdy and durable, and can be used for a long time; the transparent cover design is simple and beautiful, allowing you to view the internal paper more easily. Size information: A5 (17.5CM*23.5CM), suitable for replaceable inner pages of most standard sizes. With lock, easy to carry: this loose-leaf cover fits your briefcase, backpack, etc. It can protect your important files and record your life or inspiration anytime, anywhere. The sturdy metal button will effectively prevent the internal paper from falling. The operation is simple: press both ends of the metal button to open the ring, then insert your own paper into the ring, press the open ring from both sides to the middle to close it, which is convenient for adding or deleting pages. Super versatile: These transparent binder sets are suitable for diaries, travel diaries, business notebooks, offices, homes, schools, poetry, creative writing, sketching and painting, work records, study notes, mood diaries, practical gifts, etc.