Our product is a pack of 10 sealed to ensure the highest standards. Filtration medical sterilization, bacterial filtration> 95%. This product complies with: YY / 0969-2013 (Medical M@sks). Layer 1,the colored layer is your first line of defense. Layer 2,minimizes particle dispersal for the ultimate layer of defense. Layer 3,soft, non-abrasive inner layer m@sks the comfortable on your skin. Have any m@sks problems, please contact us.