Xhibits™ are double matted in conservation quality mat boards. They are 100% virgin alpha-cellulose (aka wood pulp) mats that are both acid and lignin free for lasting quality and maximum artwork protection. Each Xhibit is constructed using two 4-ply top mats and a backing board. The top mat is embellished with a v-grove accent around the opening which provides the illusion of an additional mat layer. Prints are permanently mounted in the mat and will not slip or move. Ships fully assembled.