Betus warranty - We stand behind our products! All items sold by us come with a one year warranty. Specifications - 11x14 inches mat with 7.5x9.5 inches opening. Ideal for 11x14 inches frame and 8x10 inches photo. We recommend taping the photo to the back of the mat. Craftsmanship - By professionals, for professionals. 45° bevel cut provides depth to your photo. White core retains the color over many years, brings out the beauty of your artwork. Acid free - Acid free white mat slows down deterioration of your pictures significantly keep your precious memories fresh as the day you take it!. Classic design - Minimalistic white mats suit any photograph and instantly draws attentions to the picture. It's time to display your favorite piece of art the right way!.