Mat Board Center, Pack of 10, 11x14 WHITE COLORS Picture Mats for 8x10 Photos Pack of 10 pieces of 11x14 Picture Mats for 8x10 Photo The opening size is 7.5"x9.5" for 8x10 print. Color: White This item comes with the 10 pre-cut matboards. The mats are beveled cut and 4-ply thick (about 1.4 mm or 1/16 inch).