8x8 Photo Mat With Bevel Cut Circle Opening for 4x4 Photos Black Acid-Free Photo Mat Includes 1 Single Matboard Our acid-free Black matboards are 4-ply and feature a white core. With an overall size of 8x8, these mats with Circle openings fit perfectly into 8x8 frames and are bevel cut to showcase your 4x4 photos. Actual mat opening size is 3.5x3.5 inches so that it may safely and securely house your 4x4 photo, artwork, needlepoint, sign, etc. This pack includes 1 Single Matboard. Proudly made in the USA by Country Art House!