50 PCS PM 2.5 Activated Carbon Filter Insert Replaceable Anti Haze Filter Paper

Curious why 1 package is white and the others 3 packages are grey? I will be returning the grey ones as they look like there wasn’t quality control happening.

Perfect size to fit into my homemade face masks and bendable to fit in the opening in the mask .Not thick, which is amazing with five layers. We used these filters to add extra protection from Covid -19 when we are around a lot of people .

These fit both my wife and I. I have a large head, she is more petite. The filters slide in easily. There is a wire for the nose to help fit. The breathing valve seems to work well decreasing the hot sweaty feel. I recommend.

Fits nicely into fabric face mask. Easy to breath through. Cuts down on fogging up glasses.

A must have item now a days. I will buy again. Shipment came earlier then they said.

It works great but I received a packet that had white and grey filters. There isn’t any difference to our experiment but thought it was odd.

The filter seems like it works well with all the layers. I just don't know how well a job it actually does as it doesn't fill in the entire mask. The area by the bridge of the nose and the sides of your mouth feel exposed as this is a small filter. The thickness of it doesn't help in the nose area as it kind of just pushes down and wants to sit naturally below your nostril area. I still use a disposable mask underneath my cloth mask with this filter in it. I don't think just this filter in the cloth mask would cut it considering the other exposed areas in the mask that aren't filled in with the filter. I like that it does add more layers and feel better having it in use as opposed to the double layer of disposable mask and cloth mask on top of that.

These filters help me feel safer.