Mylites 2 Standard Comic Book Mylar Sleeves 7-1/4" x 10-1/2" Plus 1-1/2" Fold-Over 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. Sold in Packs of 50. Measures 7-1/4" x 10-1/2" Plus 1-1/2" Fold-Over Flap.