Durable polypropylene envelope holds cassettes, CD's, crayons, rulers, pens, and more in 3-ring binders. The expandable hook & loop closure keeps everything inside. Resists tearing and stains. Assorted translucent colors; sorry, no color choice. Category: Binders - Binding / Binders. Sold as a Pack of 5. Short name: Binder Poly Envelopes Asst Colors Pack Of 5 - School Smart. School Smart Brought to you by School Specialty. School Smart Brand of Products.