A. Music score folder: It is used to store music scores, documents, etc. This music score folder has a clef and can hold around 30 sheets of A4-sized paper. B. Material: The inner pocket is made of polypropylene (PP), which is non - slip and transparent. It features a loose - leaf binding design, allowing the folder to be opened approximately 180 degrees for easy flattening of music scores. C. Waterproof thick pocket: The inner pocket is non - slip and transparent. It uses a concave - convex process to reduce reflection and help ensure that the clef won't get wet during practice. D. Applicable scenarios: It is suitable for daily filing and storage of A4 - sized and smaller documents, and can be used in offices, schools, and homes. It also performs well when used on pianos, organs, or performance synthesizers. E. Easy to operate: It can insert sheets such as choral scores and piano scores. It is a standard display album, and music scores or documents can be relatively easily inserted and removed.