Our acid-free Dill Green matboards are 4-ply and feature a white core. With an overall size of 14x14, these mats with Circle openings fit perfectly into 14x14 frames and are bevel cut to showcase your 10x10 photos. Actual mat opening size is 9.5x9.5 inches so that it may safely and securely house your 10x10 photo, artwork, needlepoint, sign, etc. This pack includes 1 Single Matboard. Proudly made in the USA by Country Art House!