SHEET MUSIC FOLDER: A4 Size Sheet Music Pockets Binder File Display Black Music Sheet Black, Used to store sheet music, documents, etc. MATERIAL: The inner pockets are non-slip and transparent with high quality polypropylene (PP). Coil binding allows the folder to open at a 180 degree angle for flat sheet music. DEEP AND THICK POCKETS: The inside 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>