Bests & Worsts Reviews from Amazon

I use these filters when sanding wood and grinding steel and when spray painting and using the dangerous gel paint stripper and I like them the air feels fresh and its easy to breathe with them. I opened them up before discarding them to see whats inside here is the picture. Hope this helped Update: I add new picture and video. I wanted to know if the filter is plastic or natural material so I burned the filter and it is plastic it melt and horrible smell of smoke update: 3m says on their website the filter material is glass fiber