Our acid-free White Linen Canvas matboards are 4-ply and feature a white core. With an overall size of 8x10, these mats with Oval openings fit perfectly into 8x10 frames and are bevel cut to showcase your 5x6 photos. Actual mat opening size is 4.5x5.5 inches so that it may safely and securely house your 5x6 photo, artwork, needlepoint, sign, etc. This pack includes 10 Matboard Show Kits With Acid Free Backings & Clear Bags. Proudly made in the USA by Country Art House!