3M Particulate Filter, For Use With: 3M 5000 Series Reusable Respirators, 6000 Series Cartridges with 502 Adapters, 6000, 7000 and FF-400 Series Respirators, P100, 0.9997 Filter Efficiency, Bayonet, Magenta, Resists: Nuisance Level Organic Vapors, Oil and Non-Oil Based Particles, 4.3 in L x 4.3 in H