Mat Frames for 5×7 Pictures by Mat Board Center These pre-sealed mats are perfect for art prints, pictures, photos and more! Order yours today and use them to their full potential. Features Pack of 25 White Mats and Bags Fits 5×7 Prints Slip In Design Acid-Free Vertical or Horizontal Display Fits 5×7 inch photographs, artworks, and more (opening size: 4.5 x 6.5) Mat board plus backing board is totally 8 ply thick, White core, bevel cut, comes with a sense of advanced Made from sturdy and acid-free material, good for long-term storage Slip in your picture/photo/print of choice Perfect for displaying your pictures in a simple fun way