Pvc Materials -- Water Resistant / Oil Resistant / Liquid Resistant And Can Withstand Heavy Objects. And They Are Semi-Transparent, You Can See The Items Inside, Easy And Convenient to Use.Clear Closure Wallet -- Nylon Strip for Hanging, Large Convenient Storage Space, Can Store All The Documents, Papers, toys, And Other Learning Accessories, office Supplies, Also for Travel, Organize Phones, Cosmetics, Passports, Badges And More.Visibility -- Thanks to Its Semi-Transparent Component, So You Can Easily Find And Display The Objects You Need. Such As Learning Cards, Small Items, Cosmetics, Pencils, Small Tools, Etc.Strong And Easy to Handle -- The Four Corners of The Folder Bags Are Well Designed, So That Won'T Scratch The Lining of Your Bags Or Fingers.30Pcs Heilwiy A6 Envelope -- 23.7*11.7Cm. Ideal for Filing, Storage And Presentation, office, Industry, Home And School.