Feature:1. 52 PAGES CAPACITY: Accommodating up to 52 pages of A4 sized sheet music, the sheet music folder is perfect for storing sheet music for your piano, keyboard, violin, cello, and guitar.2. 4 PAGE EXTENSION: The piano sheet music binder can be opened to present four pages simultaneously, avoiding any disruptions to your performance due to page turning.3. THICKENED OUTER SHELL: Featuring a thick and soft frosted outer shell that is waterproof, this sheet music folder ensures long lasting usage.4. LOOSE LEAF DESIGN: The sheet music binder features a detachable buckle design for a convenient and easy operation. This allows for easy installation and removal whenever required.5. MULTI PURPOSE USE: Besides serving as a music folder, this binder can also be used for other document storage, making it suitable for teachers, students, office clerks, and more.Specification:Item Type: Sheet Music FolderMaterial: PPInner Pages: A4 PaperSpecification: Default 52 Sheets (Inner Pages Can Be Increased by Yourself)Expandable Pages: 4 Pages.Package List:1 x Sheet Music Folder12 x Inner Pages