... board acid free and any thickness. 2.Various color and multi openings. 3.Professional quality. 4Economic Price 1. Mat board (matboard, pre-cut ... mat board, mount board, bulk Mats,card board)2. White core, black core,c ream ... art, mat frame, mat picture, photo album and needlepoint pre-cut mat board / double photo mat /4x6,5x7,8x10