10 ct. 11X17 Art Print Backing Boards and Bags 10 Ct. BCW Brand 11 X 17 Art Print Bags & Backing Boards Bags are 2 mil polypropylene thickness - Standard: 11 1/4 x 17 1/4 1 1/2 inch, flap for closure - Crystal clear Boards are Coated on one side with Buffered with 3% calcium carbonate The Boards & Bags Protect Prints while Handling & Storing