Bear paw feather tracers???

[6haase6]

Anybody used these or have info on them? How do they attach? Do they work very well? What happens to them after they go through an animal?

[sakoshooter]

http://www.tradtecharchery.com/bearpaw-feather-tracers.html

Here's a link. I think they're intention is visibilty during flight and at impact. I believe they stay attached to the shaft.