It is made of High quality PP plastic, the document folder is durable, tear-proof and water-resistant and anti- deformation. Suitable for daily filing, storing of documents and keeping all files tidy and organized. From showcasing a report to organizing schoolwork or arranging important papers, it keeps everything protected and in one easy-to-find spot.The envelope folder size is 12.79 x9.84 inches, suitable for A4/US letter size files & other small items, holds no less than 200 sheets of paper,the envelopes bags can be used at school, home, work, office, travel, and business trip.