Golden State Art， Pack of 25， Acid-Free White Pre-Cut 5x7 Picture Mat for 4x6 Photo with White Core Bevel Cut Frame Mattes<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Set of 25 White 5x7 WhiteCore Picture Frame Mats</li><li>High Quality Mats</li><li>Opening size is 3.5" x 5.5" inches for 4x6 Pictures</li><li>Mats are beveled cut and are 4-ply thick (1.4 mm or 1/16 inch)</li><li>All acid free， perfect from hobbies to art gallery exhibits.</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31u%2BTq0Z2uL.jpg" noproxy>