Music Folder: Ideal for storing sheet music, documents, etc., music folders, keys, and A4-sized paper. Features 30 compartments. Material: The interior pockets are non-slip and transparent, made of high-quality polypropylene (PP). The spiral binding allows the folder to open 180 degrees for flat sheet music. Waterproof and Thick Pockets: The interior pockets are non-slip and transparent, and their concave-convex design reduces light reflection to prevent keys from getting wet while practicing. Perfect for: Organizing and storing A4 and smaller documents. Widely used in the office, school, and home. Also works with piano, organ, or synthesizer. Easy to Use: Allows you to insert choir and piano scores, as well as other papers. A standard file folder that makes inserting and removing sheet music or musical files easy. Multifunctional Music Folder for Documents and Sheet Music Features: 1. Material: Made of high-quality polypropylene (PP), lightweight, durable, and waterproof, protecting documents for the long term. 2. Spiral binding allows the folder to open 180 degrees for flat sheet music. The folder does not automatically close on a music stand, making it easy to turn pages. 3. Ideal for storing documents, sheet music, sketches, etc. Suitable for daily filing and storage of documents; A4 size and smaller. 4. The inner plastic pockets are thick and transparent, and their concave-convex design reduces light reflection, thus protecting your sheet music or documents. 5. Standard presentation: Transparent bands seal the outer edge. Even if the folder is upside down, the sheet music will not fall out. 6. An excellent assistant for instrumentalists, musicians, students, office workers, etc. Designed for the office, school, and home. Sheets are clearly visible without glare. Specifications: Material: High-quality polypropylene (PP). Color: Black. Size: A4 / 31.5 cm x 24 cm. Bags: 30 units. Package Contents: 1 Sheet Music Folder / Choir Folder.