Our acid-free Navy Blue matboards are 4-ply and feature a white core. With an overall size of 8.5x11, these mats with Oval openings fit perfectly into 8.5x11 frames and are bevel cut to showcase your 7x9 photos. Actual mat opening size is 6.5x8.5 inches so that it may safely and securely house your 7x9 photo, artwork, needlepoint, sign, etc. This pack includes 1 Single Matboard. Proudly made in the USA by Country Art House!