Daniel Smith Pre-cut MatsProtect your artwork with these high quality archival mats. They're ideal for photographers, watercolorists and printmakers. They're also great for quick display of memorabilia such as postcards or cherished family photos. Each mat is cut from pH-neutral, acid-free white core Crescent Board and includes a pH-neutral white backing board. Double mats include two window mats and one backing board; 1/2" of the second mat shows inside the top window. Achival mats are sold in convenient, economical packs.