20 SHEETS 4"X6" PRE-CUT MAT: Package include 20 sheets off white pre-cut mat, the size of mat is about 103mm(4.06 inch) wide, 154mm(6.06 inch) long, 1mm thick, 66x110mm(4.33x2.6 inch) inner diameter.PAPER PHOTO BOARDS: All photo boards are cut on the inside with a 45-degree bevel and are made of tissue paper, which is easy to use, fade-resistant, odorless, better seal to protect photos.ART PHOTO FRAME PAPER: Mat board can be combined with your prints, pictures, photos and art for exhibitions, all kinds of art activities, your artwork creation, and enhance the artistic level.EASY TO USE: These photo frame mounts are very easy to use, just take apart the frame, put in the photos, then put the mounts on to hold them in place, and finally install the frame.WIDE APPLICATION: Using these frame mats not only effectively hides uneven edges caused by plastic sealing, cutting, or other reasons, but also holds smaller photos or paintings perfectly in the frame without falling out.