Introducing the Stalward Premium Backing Boards Treasury 259x343mm, a must-have for any collector or archivist. This pack of 50 backing boards is the perfect choice for preserving and protecting your precious treasures. Made from high-quality, acid-free material, these boards are designed to last for up to 100 years, ensuring your documents, photos, and artworks remain in pristine condition for generations to come. The premium treasury size of 259x343mm provides ample space for large and valuable items, making this pack an essential addition to any archival collection. With Stalward Premium Backing Boards, you can trust that your most cherished pieces are in safe hands.