10 pieces of PM2.5 active carbon filters for face masks.
+ 5 layer filtration system to effectively keep away dust & airborne contaminants
+ Disposable and non-washable - 7 days is the recommended time to change it out. If you use it up to 12 hours daily, please change it within 3 days. Dispose accordingly to your own comfort level
+ Measurements: 12 cm x 8.5 cm (4.7" x 3.35")
+ Made in China
Note: that this is one size only & will not fit toddler sized masks.