• This item comes with 5 16x20 black mats, 5 backing boards and 5 clear bags
• Mat opening size is 10.5"x13.5" for 11x14 photo
• The mats are beveled cut with white core and 4-ply thick (about 1.4 mm or 1/16 inch), backing is white on both side
• Acid Free, long life, long-term, well protect your memories and not fade for a long period
• Great for displaying all your memories and prints, protect them with this easy to use, lightweight alternative to traditional frames