The filter comes very well packaged in a box that can be converted into a picture frame. It is actually stored in a very high-quality leather case with a side "ejection strap," so you don't have to poke your fingers into the filter disc when removing it. The filter and its mechanism are very exquisitely crafted; despite its compact ("Slim") dimensions, the filter thread can be easily screwed in without any scraping noises or frequent attempts to attach it. Once tightened, it can also be loosened again with moderate force, provided the internal thread of the lens is undamaged and of the same high quality. The ridged areas of the inner ring are really helpful here, as you don't slip along the filter! The "glass" of the Nano-X Pro series should be beyond reproach and be among the highest quality in terms of quality and workmanship. Of course, it's generally difficult to check this in detail as a "normal photographer," and it's even more difficult with polarizing filters, but as expected, it doesn't make any obvious mistakes. On the contrary, polarization can be easily adjusted and achieves the expected effects, such as the classic anti-reflective coating of surfaces/glasses or the improvement of the color impression of the sky or water, etc. Conclusion: High-quality, compact CPL filter, which, when used correctly, continues to be helpful in noticeably improving the result of the images, despite modern post-processing methods.