This 18" x 1000' high density aluminum foil roll is prefect for covering food before storage or used to line baking sheets to prevent sticky messes. Aluminum foil can also be used to cover dishes in the oven as required for more even baking. This foil is on a roll to allow for the exact right amount to be cut off. It is freezer and oven safe for maximum convenience. This standard roll of aluminum foil is 20 microns thick.