Viaky 12 Pack RFI EMI Noise Suppressor Cable Clip, Clip-on Ferrite Ring Core Noise Filter for 5mm Dia Cable(Black)

Works just fine. Eliminated rf interference from my speaker level to pre out adapters which was being cause by TV aerial interference

Good very fast shipping

These little gems work great at reducing the irritating buzz from my old turntable. They were easy to install and the dark color certainly match my mood as those anti-vaxxers have ruined our chances for a rerurn to normal life anytime soon. If you like listening to music with an irritating buzz or him in your system, you may like these. I do have extra, if you're in the neighborhood and need a couple, get vaccinated, mask up, c'mon over, and I'll hook you up with a couple of these butes.

I installed these small magnets exactly as specified with the intention of eliminating the noise that comes from my speakers when my iPhone receives a message. Installing these made no improvement. I suspect the low priced speakers I am using are just not well shielded.

I purchased these to install on some RG-58 coax cable. They fit tight which is what you want. Applying these to cabling as it relates to RFI issues is more of a prevention that a cure so I cannot comment on their performance.