The ZERUST Plastab is an extruded plastic strip that contains a proprietary VCI (Vapor Corrosion Inhibitor) formulation designed to protect metal surfaces from surface rust & corrosion while objects are stored within an enclosure. The invisible, odorless and non-toxic VCI molecules saturate the atmosphere within the enclosure. They will protect the metal surfaces of an object as long as it is in this atmosphere. When the object is removed from the enclosure, the VCI molecules dissipate leaving the object clean, dry and corrosion free. The Zerust Plastab protects 600 cubic inches of space for a period of 1 year. The Plastab can be used in small enclosed spaces such as coin tube storage boxes, coin holder storage boxes, slab storage boxes, the drawers of tool cabinets and jewelry boxes. It will provide corrosion protection for steel, iron, brass, copper, aluminum, silver and nickel. Plastab size: 3" x 1" x 1/16" Note: Plastabs will "yellow" paper over an extended period of time. Do NOT use in proximity to antique books, valuable documents, currency or photographs. Keep out of the reach of children. More information on Zerust Vapor Protection products.