Music Folder: Ideal for storing sheet music, documents, and more. This A4-sized music folder features 30 pockets. Material: The inner pockets are non-slip and transparent, made with high-quality polypropylene (PP). The spiral binding allows the folder to open 180 degrees for flat-lying sheets. Waterproof & Thick Pockets: The inner pockets are non-slip and transparent, and the concave-convex technology reduces reflected light, ensuring your sheet music stays dry while you practice. Perfect For: Suitable for daily filing and saving of A4-size and smaller documents, widely used in offices, schools, and homes. Works great on piano, organ, or performance synthesizer. Easy to Use: Simply insert choir and piano music, and other papers. A standard display book that allows for easy insertion and removal of sheet music or music files. Features: 1. Material - High-quality polypropylene (PP) material that is lightweight, durable, waterproof, and protects documents for a long time. 2. The spiral binding allows the folder to open 180 degrees for flat-lying sheets. The folder won't automatically close on a music stand, allowing for easy and accurate page turning. 3. Can be used to store documents, music scores, picture sketches, etc. Suitable for daily filing and storage of documents; A4 size and smaller than A4. 4. The inner plastic pockets are thick and transparent, and the concave-convex technology reduces reflected light, making your music score or document files safer. 5. Standard display book - The clear bands are sealed on the outer edge. Even if the folder is upside down, your scores will not fall out. 6. A great assistant for instrumentalists, musicians, students, office workers, etc. Designed for office, school, and home. Sheet music clearly visible without light reflection. Specification: Material: High-quality polypropylene (PP) Color: Black Size: A4 / 31.5cm x 24cm Pockets: 30 pockets Package: 1 pc Music Folder / Concert Choir Folder