The Allsop CD Twinpack is made from Polypropylene, a flexible but firm plastic that protects the disc inside. It"s thin, but it"ll hold one or two discs and it"s virtually unbreakable. Each case includes fold-away tabs to attach to any binder system. Feel free to toss it in your backpack, drop it in an envelope, include it with a presentation or use it as a Frisbee.