Mylites 4 Standard Comic Book Mylar Sleeves 7 1/4" x 10 1/2" Plus 1 1/2" Flap The best raw plastic material available for permanent protection and storage. At 4-Mil, these are the thickest Mylites available. Made from 4-mil thick Mylar type Melinex 516 or equivalent. Naturally resistant to aging, decomposition, moisture, oxygen, and gas penetration. Not affected by fungus, mold, or mildew, and immune to insects and rodent attacks. Mylites 4 Standard measure 7-1/4" x 10-1/2" and features a 1-1/2" fold-over flap that can be tucked in or taped closed. Sold in Packages of 50.