Book rings offer one way to bind loose papers together securely. They work well for loose-leaf notebook paper or hole-punched printer paper. Made of high-quality metal. Premium quality metal split rings. These loose-leaf binder rings for books are made from nickel-plated metal, not easy to deform or break, and can withstand long-term use. Easy to open or close. The steel metal round ring is held together by a central swivel rivet, convenient to pull to open and squeeze to close, you can use them easily and quickly. Closed tight and let your books organized.