Our Acid-Free matboards are 4-ply and feature a White Core. With an overall size of 13" x 19", these mats fit perfectly into 13" x 19" frames. Each mat is bevel cut to enhance your 11" x 14" photos. The actual mat opening size is 10.5" x 13.5" inches so that it may safely and securely display your 11" x 14" photo, artwork, needlepoint, sign, etc. Includes backing and bags.