Keep you and your employees safe while working in caustic fumes and around chemical irritants. High Grade Organic Vapor HEPA filter cartridges Protect you while performing construction, painting, mold remediation, chemical cleaning, extermination or other airbourne contaminents or chemical vapors. Set of 2 Replacment Organic Vapor HEPA Filter Cartridges For Sperian Full Face Mask Respirators or any other respirator that requires a 3.5 diameter cartridge. • HEPA Filter Protects Against Airbourne Contaminents • Perfect for Sanding, Painting, Chemical Application and Mold Remediation Fits Sperian or Other Round Cartridge Respirators