These are BRAND NEW 10" (2 mil. thick!) premium plastic outer sleeves! [10-3/4" x 10-1/2" or 274mm x 267mm] These archival quality crystal clear sleeves are a great choice for protecting your precious record collection. Biaxially Oriented Polypropylene (BOPP) means a much better sleeve clarity than the traditional cast polypropylene or polyethylene.