Size: The cover of the sheet music folder is B4 size, 37*26cm.^ Music binder: 20 pages, 40 music scores can be placed. Elegant and simple cover, black binder, can be placed flat on the music stand.^ Usage 1: Write directly on the page. Insert the score into the fixed strip on the side, and make notes or notation on the exposed paper during practice or rehearsal. Turn pages easily.^ Purpose 2: Long-term storage and protection. Insert the music page into the crystal clear paper protection bag loaded on the top. The protective cover is waterproof, acid-free, PVC-free, and ink-free.^ Wide range of uses: Use music flipbooks for piano, violin, guitar, flute courses or band, chorus, orchestra practice, suitable for indoor or outdoor occasions. The perfect gift for music teachers, students and musicians.