3M model #8233 N100 disposable respirator is 99.97% efficient in non-oily environments. Filtering disposable respirator is suggested for use in Lead, MDA, Arsenic, Cadmium, Welding and pharmacetical manufacturing environments. Premium respirator has adjustable buckle straps, adjustable noseclip, faceseal for a soft, secure conforming fit and 3M Cool Flow Exhalation Valve for easy exhalation and cooler comfort. Sold each.