MAT SIZE: This matting fits a 17x21 frame. (frame not included)OPENING SIZE: This mat fits a 13x17 photo / print. (Actual opening size is 12.5x16.5)Matting Material is Crescent Mat Board.Dark Bottle Blue Finish / Cream Core with White Backing (PH Neutral).This listing includes (1) Custom Cut Mat. (The size selected represents the OUTSIDE dimensions of the matting.)
This matting fits a 17x21 frame with an opening size for a 13x17 photo / print (Actual opening size is 12.5x16.5). The reason for the smaller "actual" opening size is to create a .25" overlap on all sides so that the matting sufficiently covers and correctly adheres to the photo or print for proper display.
17x21 Matting for Picture Frame Dark Blue with Cream Core and 13x17 Opening Size B334MAT QLFZCWFIY