The Print File Archival Storage Page for Negatives is thin backing, high clarity preservers that are used to securely store the negatives.This negative storage page can hold 15 frames of 6X4.5 cm, 12 frames of 6X6 cm, 9 frames of 6X7 cmThe Print File Archival Storage Page for Negatives has strong and continuous ridges that avoids negative hang upIt is made of high-quality polyethylene for safe and long-term storageThe top sheets of this negative storage page are of 3 mil and bottom sheets are of 1.8 mil