The 18 x 24" Archival Mat and Presentation Kit for 13 x 19" Print from Archival Methods is used for presentation, exhibition, or just to preserve your prints, photographs, or documents. The kit consists of a 4-ply, bright white museum board, which is made of 100% cotton with a 1/8" thick acid-free foam backing board. The archival museum board has a centered, 12.5 x 18.5" bevel-cut window that can be hung in a vertical or horizontal orientation. In addition, the kit includes mounting corners to mount your photograph to the foam board and Tyvek tape to hinge both boards together. Once everything has been assembled, you can carefully place your mounted photograph inside the crystal-clear bag with an adhesive closure.