Lineco photo corners are pressure sensitive corners, constructed in traditional style design, are different than most similar marketed corners. These corners hold the print firmly but will not touch the original - a plus for archival users. Also, the adhesive used is rugged and holds an 11 x 1`4" print. Lineco Archival MaterialsLineco Archival materials for the professional framer hobbyist or for office use. Materials for mounting, repairing, cleaning and preserving. Ideal for prints, photos, postcards, or any paper item. All products are acid free with a neutral pH.