This Harley L-188 brand, N95 particulate respirator, conforms to NIOSH standards approved through the CDC and FDA. These masks help to decrease the transmission of COVID-19, viruses, and other germs, as well as block dust and microorganisms through 95% filter efficiency. They are hypoallergenic, latex free and fiberglass free. Features include an adjustable nose bar and adjustable, padded nose piece for a comfortable fit, recommended for single use. Quantity ordered must be in increments of 400pcs. FDA Registration # 3016680688.