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. Only a few of these high discount cans are available.
Nature of defect: a small amount of moisture entered the cap area, causing staining to the metal ring at the top of the can, and inside of the plastic 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.