45 Yard Brodart Just-A-Fold III Rolls 3 Pack Combo 9" - 10" - 12" Archival Book Covers Paper backing with perforated folding lines for ease in application Super Clear Covers Allows DJ brilliance to show through pH Neutral PVA adhesive used to attach Chemically Stable 1.5 mil polyester film Bottom Loading Covers Allows flexibility in fitting different sized books. Can be folded to fit book several inches smaller than stated size