Each pack of Mylites2 comes with 50 standard (7-1/4" x 10-1/2" plus 1-1/2" flap) comic book size protective sleeves. Fits comics from 1970's-1990's. Mylar is also the most stable plastic, with zero off gassing. It does not absorb moisture like poly bags, and it is 100 times more resistant to the diffusion of oxygen! Use the material specified by the National Archives, the Library of Congress, and preservation experts around the world!