These 2 Mil Resealable Comic Book Bags are made of Archival Polyester (Mylar).
Mylar will not discolor, damage, or adhere to items placed inside it. It is resistant to moisture, mold, mildew, etc. Best of all it is crystal clear. 100 Bags per Pack. 7" Wide x 10 1/2" Tall + 2" Flap.