Amazon
Double mount - White acid-free mount board. The mount overlaps the picture by approximately 2.5 mm on each edge, so the opening is approximately 5 mm smaller in both width and height than the stated picture size.
Double mount - White acid-free mount board. The mount overlaps the picture by approximately 2.5 mm on each edge, so the opening is approximately 5 mm smaller in both width and height than the stated picture size.