200 Ct. 11x17 Art Print Backing Boards and Resealable Bags 200 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 - Resealable 1 1/2 inch, flap for closure - Crystal Clear - Resealable Strip Boards are Coated on one side with Buffered with 3% calcium carbonate The Boards & Bags Protect Prints while Handling & Storing