Music Folder: Used to store music notes, documents, etc., music folders, keys, A4-size paper with 30 compartments. Material: The inner pockets are non-slip and transparent with high-quality polypropylene (PP). The spiral binding allows the folder to be opened at a 180-degree angle for flat music sheet. Waterproof and thick pockets: The inner pockets are non-slip and transparent, and the concave-convex technology can reduce the reflected light to ensure that your key does not get wet while practicing. Perfect for: Suitable for daily filing and saving of A4-size and smaller than A4 documents, widely used in office, school and home. Works equally well on piano, organ or performance synthesizer. Easy to use: choir and piano notes and other papers can be inserted. A standard display book that can be easily inserted and removed from the music notes or music files. Product Description Music Folder, Multifunctional Sheet Of Paper Document File Music Folder Organizer Folder Features: 1. Material - High quality polypropylene (PP) material which is lightweight, durable, waterproof and capable of long-term protection of documents. 2. The spiral binding allows the folder to open at a 180 degree angle for flat sheet music. The folder will not automatically close on a music stand. This allows for easy and accurate turning of the pages. 3. Can be used to store documents, music notes, picture sketches, etc. Suitable for daily filing and storage of documents; A4 size and smaller than A4. 4. The inner plastic pockets are thick and transparent, and the concave-convex technology can reduce the reflected light, making your sheet music or document files safer. 5. Standard display book - The clear bands are sealed on the outer edge. Even if the folder is upside down, your notes will not fall out. 6. A good assistant for instrument players, musicians, students, office workers, etc. Design for office, school and home. Sheet clearly visible without light reflection. Specification: Material: high quality polypropylene (PP) Color: black Size: A4 / 31.5cm x 24cm Bags: 30 bags Package: 1 pc Music folder / Concert choir folder