Pre-cut mat board acid free and any thickness. Various color and multi openings. Professional design,color and style. 1. A photo frmae and mat board (matboard, pre-cut mat board, mount board, bulk Mats,card board)2. A various of colors, white core, black core,c ream core mat board3. Lignin free and acid free4. Thickness: 0.5mm--3.0mm5. Bevel cut, reverse bevel cut, V-groove 6. Multi layers and ...