Holds seven 35mm strips of 4 frames, 28 frames totalExclusive thin backing coupled with high clarity allows you to make quality contact sheets without removing or handling negatives Contact prints on 8.5x11 Strong continuous seams prevent negative hang up 3 mil top sheet and 1.8 mil bottom sheet Archival quality polyethylene - NO PVC - safe for long term storage PAT passed 25 pages per pack