Music Folder: Used to store sheet music, documents, etc., music folders, treble clefs, A4 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 open at a 180-degree angle for flat sheet music. During practice. Perfect for: Suitable for daily filing and storage of A4 size and smaller than A4 documents, widely used in offices, schools, and homes. Works equally well on piano, organ, or performance synthesizer. can be inserted. A standard display book that can be easily inserted and removed from the sheet music or music files. lightweight, durable, waterproof, and can protect documents long-term. 2. The spiral binding allows the folder to open at a 180-degree angle for flat sheet music. The folder does not close automatically on a music stand. 3. Can be used to store documents, sheet music, picture sketches, etc. Suitable for daily filing and document storage; the technology can reduce reflected light, making your music score or document files safer. 5. Standard display book - Transparent bands are sealed on the outer edge. Even if the folder is upside down, your scores will not fall out. instrumental musicians, musicians, students, office workers, etc. Design for office, school, and home. Sheets clearly visible without light reflection. Specification: Material: high-quality polypropylene (PP) Color: black Size: A4 / 31.5 cm x 24 cm Pockets: 30 pockets Package: 1 pc Music Holder / Concert Choir Folder