200 BCW NON-RESEALABLE Silver Comic Bags & Backer Boards 200 Ct. Silver Age Comic Boards & 200 Silver Age Comic Bags Bags are 2 mil material thickness Standard: 7 X 10 1/2 - 1 1/2 inch flap for closure - Crystal clear- Boards are Coated on one side - Buffered with 3% calcium carbonate