bcw silver age comic book backing boards - 100 ct 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