The K&F Concept's 4-pack lens filter set for the GoPro is a very functional, easy-to-use, high-quality filter set. Here are some of the things I've learned during ownership and things to consider before buying. I. Quality — They appear to be very well made from quality materials. I reckon they will hold up well over time. II. Performance — They are very effective at what they are designed for. They fit well, bolt on perfectly and provide the intended filtering capabilities. However, you need to know when to use them to notice a difference. Overall this is a very nice set of high quality filters specially designed for your GoPro 9,10,11. I was very pleased with their skills and quality. I will definitely update this review if I ever have any issues. If you find it helpful to see a close-up visual inspection of this product, I encourage you to watch my included full-screen video. They say a picture is worth a 1000 words, well it's a video! You can trust that this review is simply my honest opinion trying to give you helpful insights that I would have liked to have had before deciding to purchase this product. Hope it was helpful in your decision.