Our acid-free Forest Green matboards are 4-ply and feature a white core. With an overall size of 5x7, these mats with Oval openings fit perfectly into 5x7 frames and are bevel cut to showcase your 4x6 photos. Actual mat opening size is 3.5x5.5 inches so that it may safely and securely house your 4x6 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!