ecommended by many authorities when social distancing is not possible Highly effective surgical face mask, Protect you and others from droplet, aerosols, pollutants, pollen; High bacteria filtration efficiency (BFE) ≥90%, non-medical face mask, size 17.5x9.5cm. 3 layers of tested non-woven fabric, that highly filtered, breathable and fresh - Antibacterial and dust-proof - Contamination-proof - Not for medical use - Conformed to Standard GB/T32610-2016 Reminder - If you feel unconfortable or reaction when wearing the mask, please stop wearing it - Please keep the mask in a clean, dry and cool place with humidity <= 80% - Replace the mask when necessary, not suggest to wear it long time - Replace the mask every 4 hours