The set includes 3 colors: beige, brown, black Advantages of masks with silver ions: Bacterial filtration efficiency ⩾ 99.9%. BIOSILVER Lab® solution (bio-silver), which the masks are impregnated with, neutralizes sources of infection that get on their surface. Bio-silver has a wide range of antimicrobial activity against pathogenic bacteria, viruses and fungi, including antibiotic-resistant strains and drug-resistant forms of pathogens. 12 hours of extreme protection! HEALTHMONITOR® MASK protective masks with silver ions are the latest development of scientists from the Novosibirsk Akademgorodok. A regular medical mask should be worn for no more than 3 hours, since it quickly accumulates harmful microorganisms. The HEALTHMONITOR® MASK protective mask with silver ions is effective for 12 hours! HEALTHMONITOR® MASKs – long-lasting and reliable protection!