1.Mat board,mats,matting 2.Acid free mat board 3.A variety of colors, sizes 4.Any multi opening mat board 1.mat board material:paper ,cardboard, art paper ,printing paper .thickness is 0.8-4 mm.2.Customer's LOGO can be printed for promotion and advertisement.3. Any size 4x6",5x7, 7x9", and more size4. Any colour and any printing are available5. Paper frame with mat board can have one opening,2 ...