Two excellent, long-term storage products combined into one money-saving package that provides outstanding protection for valuable firearms. Tough, flexible storage bags are puncture resistant, semi-transparent and have a 0% moisture transmission rating, so rust-protected items sealed inside will remain rust and corrosion free indefinitely. Resistant to all petroleum based oils and solvents and completely non-biodegradable. So tough they will never break down, even in full contact with soil or moisture. Each "Blox" protects up to 300 cubic inches of airtight space with time-released, corrosion-inhibiting vapors. "Blox" rust and corrosion formation on steel, aluminum, copper and brass for at least one year. Will not harm or discolor the protected item.