Adorama Albums offer maximum protection for photographs, slides, documents, and other types of memorabilia. All Adorama Albums are acid-free throughout; board, adhesives and covering materials are all quality. The exterior metal corners are the finest available and give these boxes extra stacking strength. You won't find a better, more durable album in the same price range. The interior box board is lined with white lignin-free paper and buffered with 3% calcium carbonate for an alkaline reserve to protect the paper against migrant acidity and atmospheric sulphur