These particulate filters are made with proprietary Advanced Electrostatic Media (AEM) consisting of highly charged microfibers arranged in an open formation that enhance the capture of airborne particles while allowing for greater passage of air through the media. They are both flame- and water-resistant. They are easy to install. Compatible with 3M Half Facepieces 6000, 6500/6500QL and 7500 Series, and Full Facepieces 6000, FF-400 and 7800 Series.