3 pack.

Activated carbon High-quality materials: Made of activated carbon and non-woven melt-blown filter cloth, 5 layers filter system effectively keeps away a range of airborne contaminants

Size Measurement: Carbon filters size measures approx 4.72 x 3.15 inches, compatible with most dust, easy to insert or replace the original one

Easy to use: just put it in the PM2.5 filter opening of your Eurotard Cotton Face Mask

1. Filter insert can not be cleaned and should be replaced every week.

2. When film or sticky sediment stains emerge, please replace the filter

Activated Carbon Filters: 100% brand new and high quality. It's compatible with majority of mouth cover available in the market.

Adult PM2.5 Activated Carbon Filter 5 Layers Replaceable Filter Paper