I've had a few items from K&F Concept and have found the quality and functionality of their products to be excellent. I've also already have one of their filter sets for an action camera so knowing what to expect I ordered this set for DJI's Mini 5 Pro drone which has a CPL filter and 5 ND filters (8, 16, 32, 64 and 128). Once out of the box the filters are held snuggly in a foam layer inside a plastic holder which keeps them well protected when stored in my camera bag. Installing them on to the drone is easy as the chosen filter simply clicks in to place over the lens just like the official DJI filters and the reassuring click gives confidence that they won't detach during the flight. Also whilst they are incredibly light so they add very little to the drone, they look and feel like a premium product and don't feel cheap in any way.During use I've found they already improve my photos and videos even though I'm still learning how to use them properly and which filter to use depending on the lighting conditions. The only gripe I have is the CPL filter which needs to be aligned properly depending on how you use it and it's not easy to see where the dot is or make sure it's in the right place. Otherwise I can't fault this set and I'm extremely pleased with how these filters perform. Highly recommended.