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Features Material:Ni-Zn Specification:3.5mm, 5mm, 7mm, 9mm, 13mm Application: Can be installed for all kinds of wire rods, like power line, sound cabling, AV cable, USB cable and so on. Function: It can reduce electro-magnetic interference by improve electromagnetic field surrounding the electromagnetism effectively. Common Wire Diameter For Reference 13mm-dia: Industrial data cable like 24 AWG HDMI wire, bold VGA multi-core shielded wire, DVI power cable, and audio cable 9mm-dia: Industrial data lines like HDMI wire, VGA wire, DVI power cable, speaker cable 7mm-dia: AV line, coaxial audio power line filter, industrial serial data cable 5mm-dia: Driving recorder, speaker line, mouse and keyboard USB data lines, RS232 serial line 3.5mm-dia: Driving recorder, headset speaker line, mouse and keyboard line, USB data cable Better effect by choosing ferrite core similar in dimension with line Customer Service: if you have any questions please feel free to contact us. We'll get back to you as quickly as we can.