The package arrived on time as agreed. The product was well packed and the production itself seems to be good. So far, I've only done a quick test and I'm happy with the results. I recommend considering the price, quality, delivery and good communication with the customer service. Thanks

PROS: I’ve went out and shot with them a few times and have already gotten good results. The ND and CPL help cut out nasty frequencies and aid in boosting contrast. The ND is great for sunny days and the CPL is best for areas with water, glossy surfaces, cars, trying to get computer monitors in your shot, etc. The ND and the UV live in my lens.
The UV is a must have to protect any expensive lens. Comes with a nice storage pouch. The filters are stackable which is handy. The cleaning tool is nice and works well. The brush retracts, and the microfiber tips are great for cleaning the hard-to-reach glass of your viewfinder.

CONS: The CPL filter can be very difficult to remove from a lens as the gripable part of the filter is very small but you’ll get it eventually.
The ND filter doesn’t seem dark enough given it’s rating but it’s still fine. The filters are very, very noisy when they’re being screwed onto the lens / each other. Just a small annoyance, but put them on in the car before your scare any wildlife off.

Started using them this weekend. They make a huge difference. Easy to install and change or stack.

This is a nice trio of filters. Nice little case as well. A very good value.

Very good quality filters.

I’ll start this review with a couple of points: I was already familiar with K&F Concept, as I have several of their lens adapters (available here and elsewhere) to use vintage lenses on modern digital cameras. So, I had an expectation of quality from them. Second, I’m pretty much a filter snob. I use a UV filter on all of my lenses as a combination image improvement step and a protective measure.
Those things being said, there are three basic filters that photographers should carry: UV/protective, neutral density, and circular polarizer. It’s convenient if more than one of your lenses use the same filter size, because you can just swap between lenses and sometimes stack them. The 55mm size I got works on two families of the vintage lenses I shoot with, and I had been lazy about getting the ND and polarizer to use with them, so this was a way to solve more than one problem. (This kit is available to fit a wide range of filter thread size).
I mentioned that I’m a filter snob. If you’re putting an extra glass surface between you and your subject, you don’t want it to reduce your image quality. For this reason, I’ve always used multilayer antireflective-coated filters. On first inspection, the K&F Concept obviously has a high quality coating. They are labeled “HMC,” which is a designation used by one of the major filter companies. It may be that that company makes these for K&F; if so, that validates the quality for sure. Looking through them, they are optically excellent. The filter rim is made with two knurled gripping areas to make it easy to install and remove. (These may interfere with installing some old-school lens caps that fit down over the barrel of the lens rather than clipping on) The polarizer rotates smoothly, and the ND4 is correct for a two-stop light reduction. The included case makes it easy to have the filters ready in your camera kit.
I like lens pens. Having a clean lens brush handy is a necessity if you shoot in the real world. But the cleaning tip is kind of amazing: It’s like having a microfiber magic wand to safely remove smudges from your optical surfaces.
So, overall I think this is a really nice kit and a great value. You can buy lesser filters for more money for sure. Consider the lens pen a surprise gift.

Great items to have if you love photography.

Lenses arrived but the ND4 filter was cracked. I reached out to the company to ask for a replacement and they shipped out a whole new set for the trouble. I was impressed with the response speed and their willingness to make things right. The lenses are decent quality as well. I've used the circular polorizing filter to take some great shots of river otters, using the filter to eliminate glare off the water surface. If you don't know the filter is meant to be turned while you look on your screen to find the best angle of rotation for glare reduction since this is variable. While it won't kill it completely, it will reduce glare significantly and improve the picture quality. The UV filter is great quality for the money and I took pics with and without and saw no reduction in quality with the extra glass in front of my lense. I have not used their ND4 lense yet but I did purchase their Nano ND1000 lense to take some long exposure shots and the nano line is even better quality glass and worked perfectly. While I did see a slight color shift I was able to fix in post without much effort. Pretty much par for the course when it come to heavy ND lenses based off my research in the matter. Overall, I feel this is a good buy for the beginner photographer like myself that wants to dabble with lenses and not spend a small fortune. I will say you need to spend a minute cleaning these lenses once you get em since they have some fibers and smudges on them. I would assume this is standard practice at this price point.

I'm a newbie in photography so I cannot talk about the picture quality but as far as I can tell us a very good product an for way less than the known brands

Simple