Both of the mat board choices below are made by Crescent Paper Company. Both types of mat boards are the same thickness (4ply about 1/16"). All of our mat boards will arrive looking equally as beautiful. Decorative Paper Mat Boards (Crescent Berkshire): Select this mat board option if you want to get a low cost mat board, they are about half the cost of acid free mats. These mats are not acid free mats. They are what furniture framing companies use for production framing. Acid free conservation archival mat Boards (Crescent Select): Select this mat board option if you want to go with an acid free mat board. These mats are safe to use on original fine art. They are safe to come in contact your fine art work. Picture Frame Mat samples are 2"x4" pieces of mat board that are for people who need to make sure that the mat color they see on their monitors are true to life. We have made every effort to make the mat board colors look as close as we can to their true colors but they are not perfect because everyone's monitor colors come across a bit different. There are over a million whites in the world so showing you the subtle differences online is impossible. If you need to make sure about the mat board colors before you order mats then we highly recommend ordering mat board samples so you can be sure the colors are exactly what you need.