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 1960's-90's Thanks to Mylar, the strongest plastic available with 1/3 the strength of steel, you'll get protection from:        Humidity       Volatile poly bag breakdown       Acid migration       Oxygen decomposition       Insects       Ultra-violet fading       Mold and mildew       Oils and greases 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! Mylites2 from E. Gerber.  The 2 mil sleeves are twice the thickness and 4 times the protection of 1 mil thick bags. The most popular Mylar sleeve.This is a factory sealed 50 pack