This sheet is made of PP material, non , lightweight, sturdy, waterproof, and can guard documents for a long time. Perfect for home, office, school, daily use, such as keep school papers, travel files documents, or music sheets organization. Features - ColorBlack -Material:PP - Size: 31.50X24.50X0.40cm/12.38X9.63X0.16in -Specification: 30 Pages - is regarded as file folder. Widely used in piano, erhu, etc. at school, home, office, etc. -In A4 size design. Suitable for daily filing and storing of documents; A4 sized and lesser than A4. -The flexible central circle offers easier page turning by one hand, convenient for you to use. -File paper storage folder is made of PP. Thickened hard shell is more durable and not easy to damage and deform. -Great for school students, music students, home or office organizations, presentations and projects. Package list: 1 x