Pioneer Page Protectors - 12" x 12". Each package contains 5 top loading page protectors, white sheets, spacers and 2 extension posts. Archival, acid and lignin free and made from non-coated polypropylene. Fits MB-10, FTM-12, FB-12, WF-12 and TM-12 albums in post bound,3-ring or staple-strap style.