This clear Print File Print Preserver is made of durable 8 mil black polypropylene and holds four 4" x 6" prints. Black page S-series archival album pages are designed for S-series albums and are ideal for digital prints. Barely noticeable blind stamp on edge of page does not distract from images. Can hang in file cabinet using plastic or metal hanger bars. PAT passed, archival quality, acid free, photo safe.