Spiral-bound file binder with 20 double-sided sheet holders, designed to hold up to 40 music sheets easily. Wide application across offices, classrooms, hotels, cafes, hospitals, laboratories, warehouses, music venues, and presentations. Ideal for musicians, pianists, cellists, bands, drummers, players, and hobbyists. Versatile for organizing music sheets, theses, test papers, artwork, files, documents, meeting contracts, receipts or invoices, and even recipes. Twin coil binding with 360-degree flipping or 180-degree flat opening. Anti-slip page holder and writable pages. Suitable for junior or senior students, teachers, and office staff. Use scenarios: - In rehearsal or on stage to keep music sheets within easy reach during performances. - In class or study sessions to organize handouts, tests, notes, and assignments. - In the office to keep contracts, receipts, invoices, and other documents neatly arranged and ready to file.