The product comes with quality packaging, externally cared for while internally we find a plastic package to transport and store the filter itself.

(in the video you will find, unboxing, first impressions, test and review)

I will not dwell on the technical specifications since they are already widely mentioned in the product description but, I will tell you about my experience of use and impressions.
As soon as we open the package we immediately find the filter in our hands, housed inside its transport package.
It is immediately noticeable how the filter is of excellent workmanship as regards the materials, the coating of the glass is easily visible since it tends to give a greenish reflection to the lens but, this reflection does not change the tonal range that we will have in the photo, the filter however tends to lose about one stop of light.
I immediately tested the product and it was highly efficient, firstly because it does not tend to create lens flare resulting from the presence of lights and headlights, secondly the adjustable polarization manages to bring it to a good level and also cancel reflections on water and shiny objects.
The loss of detail is almost negligible.
The tests were performed on a Sony A7M2 with a 50 F1.8 lens

In conclusion it is an excellent product that boasts a good quality/price ratio, my final rating is 5 stars