This is the standard 12 oz. aerosol spray can of Corrosion Block, but there is a slight defect to the can and cap, so it sells at a heavily discounted price.
Nature of defect: a small amount of moisture entered the cap area, causing some rust stains to the metal ring and cap. It is a cosmetic defect only, with no change to the product, or how the product works.
Note: due to heavy discount, this item is non-returnable.