Mylites 2 Current Comic Book Mylar Sleeves 7" x 10-1/2" Plus 1-1/2" Flap - Pack of 50! At 2-Mil, these are twice as thick as regular Mylites! Resistant to aging, decomposition, moisture, oxygen, and gas penetration. Not affected by fungus, mold, or mildew. Immune to insect and rodent attack. The fold-over flap can be tucked in or taped closed.