Precisely die-cut from quality 14-Ply mat board. Black has smooth matte finish. Backing is not included. 8" x 1 ", 4 1/2" x 6 1/2" Window, Black. Pack of 10 Mats. Economical, convenient die-cut mats for displaying your students" artwork. Quality, acid-free mats without backer board. Professional-looking 45-degree bevel cut. Can be used vertically or horizontally.