Professional Series Half-Mask Respirator with G71 OV/P100 Kits, Medium NIOSH-Approved protection for metal fumes that are generated during Aluminum Welding. NIOSH-Approved particulate filter provides at least 99.97% filtration efficiency against particulates generated in sanding and grinding applications in the Body Shop. Relief from the irritating effects of nuisance level Ozone. NIOSH-Approved protection for Paint-Spray and other Organic Vapors. Includes 1 Half-Mask Facepiece, 4 OV/P100 Cartridges and 1 “ Guard” 9261 No -