Archival Negative Pages Holds Four 4 x 5 Inches Negatives or Transparencies, Pack of 25 Holds four 4"x5" negatives or transparencies Exclusive thin backing coupled with high clarity allows you to make quality contact sheets without removing or handling negatives Strong continuous seams prevent negative hang up. Top sheet is 3 mil and bottom sheet is 1.8 mil. Archival quality polyethylene - NO PVC - safe for long term storage.