Crescent High Quality Pack of 10 11x14 WHITE White Core Picture Mats for 8x10 Photos Crescent High Quality Set of 10 pieces of 11x14 white core 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 with cream core and 4-ply thick (about 1.4 mm or 1/16 inch).