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 3.5MM (inner diameter): suitable for 3.5-4.5mm 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; Package included: 20 cable clips, with 5 different size 3.5/ 5/ 7/ 9/ 13 mm inner diameter.

Material: nickel-zinc ,plastic Color: black,Brand new. Well Made and Nice Quality:Made of Plastic Housing and Ferrite Core,with inner self-adaption clip can mount on cables tightly and work for a super long time. Easy to install and convenient to use. The cylinder can be dismountable, and the port has the elastic clip fastener. Application Occasion:Clip them on AC power lines,USB cable,mouse cable,keyboard cable,headset cable,video cable,audio cable,data cable. Package included: 20 * cable clips (with 5 different size included) for cord with 3.5/ 5/ 7/ 9/ 13 mm inner diameter.