"Lineco archival mounting strips provide safe, hingeless mounting of prints and photographs to mats. Made from conservation-quality archival polyester (Melinex or equivalent) with an acid-free paper backing and removable self-adhesive strip, the clear strips cradle artwork so adhesive never touches the surface. Each strip measures 3.17 cm x 10.16 cm (1.25"" x 4"") and the pack contains 12 pieces that can be cut to size."