Material : cotton
Size : 18x11cm
Package Include:1 PC Mask and 1pc filters /Opp bag
if you need filters pls add it in your shopping cart ,we suggest the new filter use around 3-5days
You can buy some extral filters to replace , you can replace once a week .
The filters are 2 pieces per OPP bag , 20 pieces filters have 10 OPP bags in total .