THIS IS FOR ONE SINGLE MAT only w/o a backing board or bag, Featuring a picture opening for a 11x17 inch photo, and a 16x20 inch overall size. Picture openings are cut 0.5" smaller than the photo size advertised to overlap the photo and help keep it securely in the frame. MADE TO DISPLAY a 11x17 Photo and fit in a standard 16x20 Picture Frame. 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 MATTE BOARD COLOR is a vibrant Deep Red. All of our Precut Matboards are proudly MANUFACTURED IN THE USA.