These are brand new Multi-Purpose Gas Mask Filters. When used with a gas mask, it can remove harmful gases, vapors and solid particles from inhaled air. While many customers are happy with military surplus gas mask filters, some prefer a filter that is current. We were told by Mestel Safety that their filters are great against the effects of radioactive fallout.
These NBC Rated filters are from a fresh manufacturing run by MESTEL SAFETY. Each one is stamped with its lot number and date of manufacture (the date stamp is 04/16). All are covered under their warranty from MESTEL. This is a NATO Standard 40mm Threaded Gas Mask Filter.