Document Features: STURDY BINDER RINGS: These round metal rings are made of carbon steel with a painted surface that is not easy to break, rust-proof, and corrosion-resistant.TIGHT LOCKING DESIGN: These paper leaf binder rings are easy to handle and organize your books quickly and tightly without falling apart when folded.Application:Binder Rings are widely used in classroom, home, or office for organizing loose pages, scrapbooks, photos, note cards, sample books, sample holders, or…