When the job requires work around tiny particles, you and your co-workers will be protected with these lightweight respirators. Adjustable nose clip ensures a more secure seal against the face. At least 95% filtration efficiency when subjected to a 0.3�m MMAD Sodium Chloride particle challenge. Suggested for grinding, sanding, sweeping and other non-oil based operations. Proprietary filter media. Respirator Type: Half-Face Mask; Rating: N95; Valved: Yes; Size: One Size Fits All.