Features 30 pockets or 60 pages Inner bag is made of polypropylene (PP) Waterproof and dustproof Easy operation Multifunctional music binder Music holder , Versatile Paper Sheet Document File Music Holder Organizer -Folder Functions: 1. Material - polypropylene (PP) material, lightweight and durable, waterproof, able to protect documents for a long time. 2. The spiral binding allows the binder to open at a 180 degree angle for flat sheet music. The folder does not close automatically on a desk. This allows for easy and accurate page turning. 3. Can be used to store documents, sheet music, picture sketches, etc. Suitable for daily document filing and storage A4 size and smaller than A4. 4. The inner plastic pockets are thick and transparent, and the concave-convex technology can reduce reflected light, make your music score or document files safer. 5. Standard Display Book - Translucent bands are sealed around the outer edge. Even if the folder is upside down, your partition will not fall. 6. A great assistant for instrumentalists, musicians, students, office workers, etc. Design for office, school and home. Sheet clearly visible without light reflection. Specification: Material: Polypropylene (PP) Color: black Size: A4 or 31.5cm x 24cm Bags: 30 bags Package: 1 piece Concert Choral Record or Music Case Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.