... , mount board, card board, pre-cut mat board)2. white core, black core,cream core mat board3. thickness: 0.8 --3.0mm4. size: 30 ... quality, color, texture and style for sophisticated, refined framing in a variety of surfaces and sizes8. can be used for matting ... core and backing paper, Surface core and backing paper buffered with calcium carbonate to alkaline reserve of 3-5%