Treated poly emits odorless, invisible, and non-toxic vapors to prevent ferrous metals such as iron, cast iron, and steel from rusting. Chemical additive in film won't flake, stick, or damage contents. Does not contain amines, phosphates, or amines in combination with nitrites and nitrates. Environmentally safe. Usable dimensions are slightly smaller. Call for details about VCI bubble and foam, custom sizes, and printing.