20Pcs Clip-on Ferrite Ring Core Ferrite Bead RFI EMI Noise Suppressor Cable Clip for 3mm/ 5mm/ 7mm/ 9mm/ 13mm Diameter Cable, Black

work great

These helped reduce the amount of RF going into my jeep’s radio.

Bought these to suppress high frequency interference in an electrical system but for my particular issue they did not help so I cannot comment much, a few of the magnets were damaged from apparent rough handling

Used in .any applications where RF energy couples to power cables Great quality and consistency

I have an older house where some LED lights flicker or pulsate. I just installed a brand new light circuit in my basement recently and that too was pulsating and flickering... really badly might i say. Someone suggested EMI was the issue. I put ONE of these ferrite cores on the new light circuit and now there is no pulsating or flickering -not in my light circuit nor in my whole home. Very satisfied.