Forever Green Eco Binder contains a high percentage of recycled material and uses Angle-D rings to hold 25 percent more paper than standard round rings. Fabric reinforcement strip adds strength and durability to the spine and hinges. The binder covers and spine are made of sturdy warp-resistant chipboard. The binder is 100 percent recyclable. When the binder wears out the rings, Quick Release mechanism allows the rings to be easily removed from the binder. Simply remove the metal tabs, and the rings pop free of the binder. Binder is designed to hold letter-size sheets.