The BCW Pro 5-Pocket page is an acid free archival quality product that is perfect for storing photographs or postcards up to 3 1/2 by 5 1/4". It is made with a combination of portrait and landscape pockets. This product is made from high-clarity polypropylene and features side-loading pockets with strong welds. BCW Pro 5-Pocket pages fit all standard 3-ring binders and albums. Use the five pocket page to protect, store, and display your valuable photos and postcards.