Features: Sheet Music Portfolio: Holds sheet music, documents, etc. A4-sized sheets with 30 pockets. Material: Inner pockets are non-slip and transparent, made of high-quality polypropylene (PP). Spiral binding allows the portfolio to open 180 degrees for flat sheet music. Waterproof & Thick Pockets: Inner pockets are non-slip and transparent; concave-convex technology reduces light reflection to keep your music dry during practice. Perfect For: Ideal for daily filing and storage of A4 and smaller documents; commonly used in offices, schools, and homes. Works equally well for piano, organ, or performance synthesizers. Easy to Use: Sheet music and other papers can be easily inserted and removed. A standard binder that allows for simple insertion and removal of notes or music files. Product: Music Portfolio, Versatile Paper Document Folder, Music Holder, Organization Folder 1. Material - High-quality polypropylene (PP) is lightweight, durable, waterproof, and protects documents long-term. 2. Spiral binding allows the portfolio to open 180 degrees for flat sheet music. The portfolio doesn't automatically close on a music stand, enabling easy and precise page turning. 3. Stores documents, sheet music, sketches, etc. Suitable for daily filing and storage of A4 and smaller documents. 4. Thick, transparent inner plastic pockets; concave-convex technology reduces light reflection, keeping your sheet music or document files safe. 5. Standard Binder - Clear bands are sealed at the outer edge. Even upside down, your sheet music won't fall out. 6. Excellent for instrumentalists, musicians, students, office workers, etc. Designed for office, school, and home use. Pages are clearly visible without light reflection. Material: High-quality polypropylene (PP) Color: Black Size: A4 / 31.5 cm x 24 cm Pockets: 30 pockets Package: 1 x Music Portfolio / Concert Choir Folder