I have no affiliation. I wonder at the marketing of a microphone related product named "Mudder". We don't want mud, do we? :- D
If the demo in the video is authentic then they do seem to work fine. Less cumbersome to set up than the "Pencil trick".
just got a couple of these. Cheap and I like the form factor. The video I linked has foam on the inside, the ones received have a mesh fabric on the outside, covering the metal screen.
The bands are cheap (aren't they always?) but it looks like thin zip ties would work fine to secure this to a mic. The frame is all plastic, seems pretty benign. Might scratch paint but probably not metal.
I paid a lot more for a Blue pop filter, even on sale but it is much better suited for end address mics and this is nice for side address. I paid $6.74 each with free shipping and they showed up quickly (from California I think).