Respirator Features A Comfortable, Flexible Facepiece And Lightweight Cartridges For An Unobstructed View Of Your Project. The High Efficiency Filters Are Pleated For Extra Surface Area Adding Long Life While Filtering 99.97 Percent Of Dust 0.3 Microns And Larger. Approved By NIOSH Under The NIOSH 42 CFR 84 Respirator Certification Regulations, Approved For The P100 Filter Classification. Use Replacement Cartridge 10023960 (Sku #: 782.7280)