Which 46mm filter?

[David DJI H]

As I has a crash this last weekend, and the vision 2 camera dropped off... (Luckily all fixed again)....
I have ordered a lens fitting kit... What filter shall I use? It's more of a protection thing so that I don't damage the vision 2 lens..
But, if there's a good one you can suggest better than a neutral one, even better..

 

[tubino]

A polarizing filter can do wonders for skies, and is a must if you fly over water.

 

[Soleangel]

A polarizing filter can do wonders for skies, and is a must if you fly over water.

Is that the circular polarizer.?
Or another one.?