- Presentation folder with 20 pockets (40 pages), suitable for A4 format, and both sides usable for maximum storage. - Inner pockets are non-slip and transparent, made from high-quality polypropylene (PP) for durability and clear viewing. - Spiral binding allows the binder to open to a full 180 degree angle, laying flat for easy writing and reading. - Concave-convex technology reduces reflected light and helps prevent sheet music from getting wet during practice. - Ideal for daily filing and storage of A4 size documents and smaller, widely used in office, school and home, and it also works well with piano, organ, or performance synthesizer applications. - Use scenarios: - Office: organize reports, meeting notes, and handouts for quick access and flat readability. - School: collect assignments, notes, and handouts in a single, easy-to-browse folder. - Music practice: store and view sheet music on a piano, organ, or performance synthesizer, with reduced glare and moisture protection during practice.