30 PCS Adult PM2.5 Activated Carbon Filter 5 Layers Replaceable Anti Haze Filter Paper

I have no way to test or evaluate this filter as I'm not a lab. I will say that they all arrived in excellent condition and well packaged. The filters are consistent in size and construction. They are all sewed properly. They come on a perforated sheet attached to each other but easily separate from each other. I can breathe through them just fine.They are 5 layer as I sliced the end of one to check. They fit great in these masks I purchased both on here from Korea and from missy mask dot com. I like missy masks masks, but don't know that I trust their filters with that silvadur technology. This is the filter we're going with.

Filters arrived within 6 days of order. Fit perfectly into the Olson Mask Pattern and other style masks I’ve made.These are the REAL DEAL filters and not sewn like the fake ones are! Highly suggest you use this vendor. I’m very pleased with the product and fast service. Thank you! Already recommended this vendor to others who need the filters but held off until I received mine and could show them the quality!

What you get is what is advertised. Great quality! NOT the fake ones that are sewn together and punched through.... These are LEGIT.

i ordered these filter thinking they were made in usa. that is what i said i wanted. surprise! when i received filter they were made in china. they went in to trash. thanks amazon for misleading me.

NOT 5 layers. More like 3 which is the front layer middle carbon layer and back layer. Used with a mask it will add extra protection. Arrived earlier than anticipated.

Made in China! Breathing in through the filter. No need to say more.

These were very thin and not 5 layers. Very disappointed.

Good quality filters. 5 layers but not overly thick. Fits my cloth mask perfectly. Thanks.

Están muy bien, buena protección aunque un pelín rígidas y un pelín pequeñas para mascarillas de adultos.

Hard to bread. Gave me an anxiety.