Stay safe and healthy by donning one of our KN95 face masks! Measuring 6" x 4", each white adult face mask features 5 layers of protection and is designed for non-medical use only. It is not recognized by the CDC or FDA as safe or effective against COVID-19 or any virus, plus there is no guarantee that it will protect users from any illness. No customization offered at this time. Chinese Standard: GB2626-2006. BFE rate of 95%.