11x13 Matting for Picture Frame Bay Blue with Cream Core and 7x9 Opening Size (B143MAT) MAT SIZE: This matting fits a 11x13 frame. (frame not included) OPENING SIZE: This mat fits a 7x9 photo / print. (Actual opening size is 6.5x8.5) Matting Material is Crescent Mat Board. Bay 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.)