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

Application Occasions of This Great Noise Attenuator 1.Great for blocking RF-interfere 2.If you have computer interference around your computer, get a set and use them,they work. 3.If you are a ham radio operator and the antenna is in your attic.Put them on USB cables, power cables 4.Fixed LED lighting interference from some over-the-air television channels 5.More occasions Sizes Specification 3MM (inner diameter): suitable for 3.0-4.5mm cables; 5MM (inner diameter): suitable for 5.0-6.5mm cables; 7MM (inner diameter): suitable for 7.0-8.5mm cables; 9MM (inner diameter): suitable for 9mm cables; 13MM (inner diameter): suitable for 10.5-12.5mm cables;