Filter compatability: The mask uses a readily available and inexpensive standard 40mm NATO screw in thread connection. Because of this, it will accept standard military grade and industrial filters. Police and tactical usage: While not a front line combat mask, this variant has adopted by many Police forces for riot/tactical equipment. Speech device: This mask is equipped with a frontal position phonic Capsule that allows the use of telephones, radio transmitters and megaphone. High impact resistance: The polycarbonate wide view screen is resistant to high impact and even concentrated acids. Tear away screen shields are readily available. Immediate use and cleaning: The mask is designed to be quickly donned, cleaned, and disinfected with simple solutions. This mask is uniquely designed to fit and seal a wide variety of face sizes and shapes for easy seal. Straps have Quick connect clips for ease of use. Information provided is directly from Sekur to validate. Gray speckles on mask seem to be a powder associated with original packaging and easily wipes off.