PM 2.5 activated carbon filter (5 layers), permanent household protective filter, effective non-woven cotton filter (100PCS)

The reason I don't give it 5 stars is because I have one issue with it- you need to get the perfect size mask in order for these to fit right, otherwise theres not really a point because its uncomfortable and doesn't filter as good as it should. For the masks that did fit them well they worked well. They aren't super thick so its easy to breath in them vs others, despite being shoved in a cloth mask.

I add these to my current masks and I throw them away each time I wash my masks after each use

It was just what I expected and wanted.

Great

Although the size is clarified, when placing them inside the mask pocket they are very small and move inside it. Only using them between the face and the mask are they fixed.

Great buy for the price. Prefer these over single layer mask; the more you buy, the lower price per unit.

Very fast delivery! Packaging was a little bit concerning to me. Lucky that this is stock. I will went about 4 weeks to use them. Other than that happy with the pricing and product.

It says 5 layers and it’s not!