The SGE 400/3 BB gas mask has been designed to meet military and civil defense requirements. Features 3 NATO 40mm DIN 3283 filter ports. Side location of filter allows a more comfortable aiming of gun. Ballistic and chemical agressive treated face shield with Butyl rubber face seal to respond to the CBRN requirements. Silicone face seal (excellent for long period use; tested for 6 days without removing). Compact large field of vision. Easy maintenance. Although these products are brand new and have been rigorously tested, they are sold as a 3rd party company and we are not liable for any misuse or malfunction.