Album650 has Flush Mounted Pages (not matted, the photographic prints become the actual pages). The spreads are panoramic (no gap/gutter between each side). Page Options: Thin (as a dime) - 10 to 50 pages/ 20 to 100 sides. Page count in increments of 5(10 sides), with a 10 page minimum and 50 page maximum for thin pages. Thick (as a penny) - 10 to 25 pages/ 20 to 50 sides. Page count in increments of 5(10 sides), with a 10 page minimum and 25 page maximum for thick pages.