Ikea Ribba Red Wooden Picture Frame 4x 6 Set of 2 Art Picture Showcase Modern Framing Frames 4" x 6" inside the frame and 4 1/4" x 3 3/4" inside the mat. Won't detract from what is framed. Can be combined with other Ikea Ribba Frames and sizes to make a picture wall. Mat is PH neutral so it will NOT destroy your photographs. Package of two allows me to offer a better value for the price.