Three-Layered Material: PET, Aluminum foil and PE Total Thickness: 10 mil (each side is 5 mil thick) Features: Bag stands upright for Easy Filling Includes: 40pcs x 1 Gallon Mylar Bags (10” x 14”) 40pcs x Label Stickers Reusable and Strong Sealing Zipper Two options for sealing the mylar bags: a reusable zipper seal and permanent heat seal. You can heat seal using an impulse sealer, hair straightener, or household iron. Keeps out light and air for short or long-term storage. Pls Note: Product does not include oxygen absorbent