100 Non-Resealable BCW Thick Magazine Poly Bags and 100 Magazine Backer Boards Bags: 2-mil Crystal Clear, Archival Safe Polypropylene Bags: Dimensions (inches) 8 7/8" x 11" + 1-1/2" flap for closure Bags : Non-resealable (requires tape for closure - not included) Boards : Dimensions 8 1/2" X 11" (fit inside BCW magazine or 'thick' magazine bags) Boards: Coated on one side; Buffered with 3% calcium carbonate; Precision Cut, Acid Free