2 Pack, Paint & Pesticide Replacement Cartridges & Pre-Filters, OV/P95, Lightweight & Easy To Block For Fit Checks, Approved To R95/OV Category, R95 Filters Are At Least 95% Efficient Against Oil Based Contaminants & Resist Degradation For At Least An 8 Hour Shift, OV Classification Means That The Cartridge Is Approved For Organic Vapors, Use With Paint & Pesticide Respirator, Replacement Cartridges For Paint & Pesticide Respirator TV #224-650.