K&F Concept 77mm Magnetic CPL + ND8 + ND64 + Ring Set with Case Works optically perfectly. Selling as I have upgraded to a lens with a different thread size. Have taken these all the way around and they have not failed me, the magnets are strong and stay well in place, I’ve never had a filter fall out. If you have any questions, please don’t hesitate to message.
eBay