Case-it Locker Ringer Accessory Presentation Binder with 1-inch O-rings, Green (Pre-02 Green) Ringer binder, 1-Inch binder that hooks into the Locker Binder system Sturdy water-resistant fabric with bound edges Perfect for middle school, high school, college students studying multiple subjects Like having a portable locker - bring your files on the road Available in a variety of colors, mix and match with Locker Binder System insert accessories