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Buy from Estory, free shipping Fulfilment by Amazon, 2-5 days expedited shipping, do not wait for weeks! Time is money!
This is 5-layer filter, it can filter 99% dust and PM2.5, it is safer and better. Double protection for you.
There are 60 pcs totally in the package, size for one pad is 4.71-*3.14 inches.Material: Cotton, Non-woven fabric and activated carbon.
We suggest change this replacement for every 3 days.But if you use them all day outside, one piece for one day is better and healthier.
If you have problems with the order, please contact me firstly. Have a nice shopping experience with Estory!