First of all, these filters fit perfectly and are finished to perfection. I was very happy with them when I unboxed them and checked that they fit my GoPro. The problem is that even with the utmost care, the two lightest filters (the only ones really useful for GoPro's factory depth rating) got scratched the first time they were used. . The plastic is too soft. You go to GoPro. They have to be strong enough not to scratch things coming on or off the boat etc. Most filters are utterly useless as they are designed for deeper water where the GoPro can't go without the dive housing.
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