FDA APPROVED 50-MASKS: Each box contains (50) SupplyAID KN95 Masks. DAILY USE: Suitable for adults’ daily travel protection, not suitable for toxic gas environment use. CORRECT USE: Please use mask correctly to avoid serious consequences caused by improper use. DISPOSABLE: Masks are disposable and cannot be washed. STORAGE: Store in a dry and ventilated location 23ºF – 122ºF (-5ºC – 50ºC, relative humidity<80%). IMPORTANT SAFETY DETAILS: This protective mask cannot generate oxygen and should not be used in hypoxic environments. Not intended as a replacement for gas masks and medical masks. Not for use if breathing is impeded or unsteady, or during sleep.