GME P100 Respirator Cartridges (6 per box) by MSA When the wearer inhales, contaminated air enters and flows through the cartridges This removes the contaminants from the air stream, so the wearer breathes in clean, fresh air Filter cartridges protect against dusts, particles and mists Chemical Cartridges protect against gases and vapors Combination cartridges deliver protecton from both particulate and gaseous contaminants