10x22 Matting for Picture Frame Green with Cream Core and 6x18 Opening Size (B524MAT) MAT SIZE: This matting fits a 10x22 frame. (frame not included) OPENING SIZE: This mat fits a 6x18 photo / print. (Actual opening size is 5.5x17.5) Matting Material is Crescent Mat Board. Hunter Green 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.)