Flex-Hinge technology allows albums to lay flat when open Rich, black color Photo-safe (acid-free, lignin-free) Flex-Hinge technology allows album to lay flat when open Completely durable, photo-safe and acid free, our Alum Covers are built to last a lifetime. Formerly known as Bookcloth Coversets, our Album Covers are handcrafted using high-quality, photo-safe materials. Our exclusive Flex-Hinge albums feature binding that lays flat, making it incredibly easy to view and enjoy your album pages for years to come. And, because they are expandable to fit up to 3 of any combination of our page packs, you'll be able to tell the whole story in just one album. Pages sold separately.