Our acid-free matboards are 4-ply and feature a white core. With an overall size of 18 x 24 these mats fit perfectly into 18 x 24 frames. Each mat is bevel cut to enhance your 12 x 18 photos. The actual mat opening size is 11.5 X 17.5 Inches so that it may safely and securely display your 12 x 18 photo artwork needlepoint sign etc. Includes backing and bags. Brand: CountryArtHouse
