Stu Art Light weight Economy Ready Mats offer a pebble textured mat with an economical way to give artwork a finished look. Mats have a folding inside border that can be folded in for trim or shadow box effect or can be removed for larger opening. Acid free. Mat size is 11 x 14 inches. Window Size is 8 x 10 inches. Does not include back. Includes:50 White Mats