Sheet Music Folder: Used to hold sheet music, documents etc, and music folder song sheet holder clef paper storage for A4 size paper with 30 Pockets. Material: The inner pockets are anti-skid and transparent with high quality Polypropylene (PP) material, spiral binding allows the folder to open at a 180-degree angle for flat sheet music. Waterproof Thick Pockets: The inner pockets are skid proof and transparent, and the concave-convex technology can reduce the reflect light, ensure your music song sheet clef wont get wet when practice playing. Perfect for: Suitable for daily filing and storing of A4 sized documents and lesser than A4, widely used in office, school and home, works equally well on piano, organ or performance synthesizer. Easy to Use: Choir chorus and piano sheet music and other papers can be inserted, standard display book, easy to put in and take out of the music sheet or files.