10-Mats You will receive 10 Individual Mats. Acid Free, White Core 4-Ply Mats Overall Size 13" x 19" - Bevel Cut Opening Size of 10.5" x 13.5" for 11" x 14" Photo Backing and Clear Bags are NOT included with this option. Our Acid-Free matboards are 4-ply and feature a White Core. With an overall size of 5" x 7", these mats fit perfectly into 5" x 7" frames. Each mat is bevel cut to enhance your 4" x 6" photos. The actual mat opening size is 3.5" x 5.5" inches so that it may safely and securely display your 4" x 6" photo, artwork, needlepoint, sign, etc.