One Single Mat With Acid Free Backing Boards And Crystal Clear Self Seal Bag, Featuring A Picture Opening For A 16X23 Inch Photo, To Fit In A 20X27 Inch Picture Frame. Photo Openings Are Beveled Cut 0.5" Smaller Than The Art Size Advertised To Overlap The Photo And Help Keep It Securely In The Frame. Made To Display A 16X23 Photo And Fit In A Standard 20X27 Picture Frame. Vibrant Brick Red Color Acid Free Picture Matting. Great Replacement For Damaged, Dirty, Or faded Matting In Your Old Frames. Premium Quality: Our Precut Photo Matboards Are Acid Free & Precision Cut With A 45 Degree Bevel By Machine For Perfect Corners And No Over-Cuts Every Single Time. Precut Acid-Free, Professionally Bevel Cut Matte Board. Custom Frame Shop And Archival Quality. All Of Our Precut Matboards Are Manufactured In The Usa.