We R Memory Keepers 12-by-12 Post (6) 4-Inch-by-6-Inch Photo Sleeves, 25-Pack 25 standard 12 by 12-inch photo sleeves for 4 by 6-inch photos Designed to work with any standard post-bound album Constructed of low glare Ultra Clear Polypropylene Film, acid free, PVC free, Archival quality, premium heavy weight, top loading, extra hinge so pages lay flat, will not stick to photos, memorabilia, or photocopies Imported