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Product: 50 PCS PM 2.5 Activated Carbon Filter Insert Replaceable Anti Haze Filter Paper Five-layer Protection：The PM2.5 replaceable filter is composed of 2 layers of non-woven fabric, 2 layers of melt-blown cloth and 1 layer of activated carbon cloth. 5 layer for better protection.
Breathable & Protection：The disposable air filter replacement contains efficient activated carbon, effectively prevent dust from entering your mouth and face, but allowing you to breathe normally.
Easy to use：The installation steps for this activated carbon PM2.5 replaceable filters are very simple. just put it in the PM2.5 filter opening
Reasonable size: The filter size is about 12 x 8cm, which is compatible with most dust covers and easy to use or replace the original dust cover
Widely Usage：The PM2.5 replaceable filter is perfect for gardening, running, cycling, travel, household,schools, and other outdoor activities etc. MMBABY

Product: 50 PCS PM 2.5 Filters Activated Carbon Filter Replaceable (50 pcs) What are Millton PM2.5 filters made of?
The Millton PM2.5 filter consists of five layers of activated carbon filter and different kinds of fabric:
*Layers 1 and 5: Spun-bound non woven material that filters out larger particles
*Layer 3 (middle): activated carbon layer. Traps particulate matter via an adhesion process.
*Layers 2 and 4: high-efficiency melt-blown filtering material that can filter small substances.
How is a PM2.5 filter used ?
It is really simple to use this filter.
What side of PM2.5 Filter faces out?
It does not matter which side of the PM2.5 faces out. The filter is constructed in a symmetrical manner such that regardless of which side faces out, you are always having the same two layers of fabric on either side of the middle carbon-activated layer (see pictures above). However, keep in mind that once used, it is recommended that you always have the same side facing out if you are going to use it multiple times. Shipped from US.Arrival within 1-3 days
Materials:made of activated carbon and Melt-Blown Non-Woven filter,Comfortable and breathable.
5 layer filtration for better protection, keep you from keep away from PM 2.5 and a range of airborne contaminants
SIZE: 12x 8 cm/ 4.9 x 3.15 inches
Package included: 50 pcs of PM 2.5 filters. Millton White