Activated Carbon Filters for Adult size Pocket Face masks.
Disposable.
Non-reuseable.
PM2.5 filter made up of 5 layers. 
Outer Layers - Non-woven
Center - Activated -carbon
Good for 3 days if worn full time or 5 days otherwise
Inserts into Adult size pocket filter masks.
*Note: Do not wash. Dispose of after recommended usage time