Sheet Music Storage Folder A4 Size 20 Pockets G Clef, Song Paper Storage Document Storage Bag for Musicians and Musicians Partition folder: Pocket Binder For Sheet Music Size A4 File Display Black Music Sheet Black, Used to store sheet music, documents, etc. Material: The inner pockets are anti-slip and transparent with high quality polypropylene (PP). The spiral binding allows the folder to open at a 180 degree angle for flat sheet music. Waterproof and thick pockets: the interior pockets are anti-slip and transparent, and the concave-convex technology can reduce reflected light and ensure your sheet music won't get wet when practicing. Perfect for: Suitable for daily filing and document storage of A4 and below A4 size, widely used in office, school and home, works equally well on piano, organ and performance synthesizer. > Easy to use: you can insert choir and piano sheet music and other papers, standard display book, easy to insert and extract sheet music or files.< /p>