These resealable bags accomodate Golden Age comic books published in the 1940's and 1950's between sizes 7 3/4'' W x 10 1/2'' L. Some comic books published in the early 1960's will work with this bag. 2 mil ultra clear polypropylene Accommodates comic books that are between 7 3/4'' W x 10 1/2'' L Polypropylene is an inert, archival quality, PVC-Free material Ideal protection against dust and moisture during handling and storage 100 bgs per pack