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;