Our acid-free Oyster Shell White matboards are 4-ply and feature a white core. With an overall size of 10x12, these mats with Oval openings fit perfectly into 10x12 frames and are bevel cut to showcase your 8x10 photos. Actual mat opening size is 7.5x9.5 inches so that it may safely and securely house your 8x10 photo, artwork, needlepoint, sign, etc. This pack includes 1 Single Matboard. Proudly made in the USA by Country Art House!