SET of 10 - GREATPACK 11x14 Black Double Mats- fit 8x10 photo art This is a set of ten 11x14 double black mats with beveled cut openings and matboard backing for each. The opening size is 7.5" x 9.5" to fit 8"x10" image sized photos or art. These are acid free neutral ph mats with a white core which does not yellow over time like many regular core mats available. These same high quality 10-packs available as both single and double mats in 5x7, 8x10, 9x12, 11x14, 12x16 and 16x20 sizes in white, antique white and black.