The Pro 4-Pocket page is an acid free, archival quality product that is perfect for storing 3.5 X 5 photographs or postcards. This product features high clarity and strong welds. Pro 4-Pocket pages fit all standard 3-ring binders and albums. - Holds 4- 3 1/2 X 5 1/4 Cards or Photos - Made of Heavyweight Polypropylene - Strong Welds - No PVC - Made in USA (100)ct