Memory Books Swinging Shutter is a page protector with a built-in panel on both the right and left edge that close to meet in the center, like a shutter. Simply open the two "shutters" to reveal what's underneath. Imagine the creative possibilities! Each page features a Universal Hole Punch that works with 3 ring, Strap and post bound albums and an Extended Binding Edge that allows pages to lay flat. Made from PVC-free, acid free, archival quality polypropylene that will not yellow, transfer ink or stick to photos.