16x20 mat board with eight 4x6 openings, perfect for displaying multiple photos or paper artworks in a large frame. A mat board (passe-partout) is a cardboard sheet, typically with a centered opening, that creates space between the photo and the frame. It protects your artworks by preventing direct contact with the glass while providing an elegant and refined presentation. This mat board is suitable only for paper-based works such as photographs, drawings, or prints, and should not be used with canvases.