Music Folder:Used to store sheet music, documents,etc,music folder,treble clef A4 paper with 40 compartments. Material: The inside pockets are non-slip and transparent with high quality polypropylene (PP). The spiral binding allows you to open the folder at a 180 degree angle for flat notes. CONVENIENT TO WRITE: Hollow center design, no barrier between the diaphragms in the middle, treble clef can be marked or modified during practice, even when it is on stage. Perfect for: Suitable for daily filing and storing A4 documents and less than A4, widely used in office, school and household. Works equally on piano, organ or performance synthesizer. Easy to use: choir and piano notes as well as other papers can be inserted. A standard display book that can be easily inserted into the sheet music or files and removed from it.