What is it:The KN95 Face Mask is a high efficiency protective mask that is manufactured according with GB2626-2006 KN95 national standards. The filtration efficiency of bacteria and particulate matters is more than 95%What it does: The KN95 Face Mask can help reduce exposure to biological substances, such as bacteria and viruses. Please note however that wearing a mask cannot eliminate the risk of infection as it depends on the proper fit of the wearer.Each pack contains a quantity of (2) KN95 face masks.Each box contains a quantity of (25) packs, for a total of quantity of (50) KN95 face masks.What else you need to know: Due to safety concern, face masks as personal hygiene products are NOT returnable. Please be aware of it before placing your order.