Bumpa bits - has anyone used them and do they work?

[Juno]

I was looking at these on the Omlet website, but they don't show pics of them in use. Has anyone used them and how good are they? I have quite a pecky hen and am worried about her with my youngsters ( chicks, not children!)

 

[ChicKat]

Here you go:

https://www.backyardchickens.com/t/673137/device-to-stop-pecking#post_916192