Cardinal ProVue Non-Stick Concealed Rivet Round Ring View Binder, 1.5 Inch, Black (31311) PVC free poly material will not stick to cover inserts or materials stored inside Archival safe for all documents including photographs Hidden rivet construction provides a clean, professional appearance Non-locking round ring metal with dual opening and closing triggers Contains 54% recycled content by material weight; 49% post-consumer recycled content