The sheet music folder adopts metal double-ring spiral binding, the opening position is accurate, not easy to loosen, and the sheet music can be easily tiled to 180 degree. The sheet music folder has a 4-sided PP hard cover, even if the music shelf does not support outer pages, it can support the sheet music well without falling down. The corners of the sheet music are designed in a semicircle, which will not scratch your hands, the inner pages are stable, and the score will not fall easily. The sheet music folder can hold 40 sheets music at the same time, not just 4 sheets of sheet music. The sheet music folder is suitable for any instrument and any occasion, and is a for instrument players. Sheet music folder is a multifunctional file folder organizer,that can store documents, papers, files, not just music scores. Colour:black Material:PP Package Contents: 4 x Sheet music folder Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. When you are practicing or playing, the sheet music folder is your perfect choice. It makes reading music easier and brings more convenience to the performer. The sheet music folder can be expanded to 4 pages at the same time, You can complete all performances without turning pages, which solves the problem of musicians interrupting performance due to page turning. There is no barrier between the inner pages of the sheet music folder,You can easily put the music score in the score folder, or you can write directly in the score folder without taking out the music score. When you are playing on the stage, you can easily see the music sheets without the reflection of light, which can relieve eye fatigue and protect your eyes. The cover of the sheet music folder is made of frosted PP material, which has the function of waterproof and anti-drop for long-term protection of documents.