2091 P100 Particulate Replacement Filters, Compatible with 6000, 6200, 6800, 7000 & FF-400 Series Respirators. 2091 particulate filters boast outstanding filtration performance with efficiency up to 99.97% and above. Wide compatibility fits FF-400, full 6000 and 7000 series respirator masks, including 6200, 6300, 7502, 7503 and other matched models. Available quantity: 16 to 400 pieces. Factory sealed in original retail package. 99.97% high-efficiency filtration.