Our acid-free Soft Yellow matboards are 4-ply and feature a white core. With an overall size of 11x14, these mats with Oval openings fit perfectly into 11x14 frames and are bevel cut to showcase your 9x11 photos. Actual mat opening size is 8.5x10.5 inches so that it may safely and securely house your 9x11 photo, artwork, needlepoint, sign, etc. This pack includes 1 Single Matboard Show Kit With Acid Free Backing & Clear Bag. Proudly made in the USA by Country Art House!