silver age comic bags and backer boards - 100ct bcw this listing is for 100ct silver comic bags and 100ct bcw silver backing boards. comic bags: the bcw silver comic bags are an acid free archival quality product made of crystal clear polypropylene. use this item to protect and store your collectible silver comics. available in 2 sizes so you can now fit your thickest silver comics into the appropriate bag. 2 sizes available for your silver comic needs 2 mil material thickness crystal clear protect comics while handling br use with bcw silver backing boards 100 sleeve(s) per pack comic boards: the bcw silver comic backer boards are made from a full 24 point solid bleached sulfate coated on one side with a buffered with 3% calcium carbonate and are precision cut to size. use this item along with silver comic bags to protect and store your collectible comics. fit silver age modern and regular comic bags coated on one side buffered with 3% calcium carbonate precision cut use with bcw silver poly & mylar bags dimensions size 7 x 10 1 2 *certified acid free independent lab tested 100 board(s) per pack