Description: Nickel Zinc Ferrite Core Rings Kit: Noise Suppressor Core Rings can improve the electromagnetic field around the solenoid, thereby avoiding external interference. Clip On Clamp Core Rings: 3.5mm/5mm/7mm/9mm 4 Inner diameter sizes. Easy to install and use, can be disassembled, is an elastic clip on the port. Features: Good performance, high efficiency and long life, effectively improve the signal quality of audio and video. The cable clip will not cause distortion of the transmission signal, nor affect of , video and pictures. Wide Application: Suitable for various kinds of electronic connecting wires, wiring harnesses, home , air conditioners, computers, inverters, electric welding machines, power cords, etc. Specification: Material: Ni-Zn Ferrite Packing Size: Approx. 17.8x10x23cm/ 7.01x3.94x9.06inch Introduction: 3.5mm / 0.14in (inner diameter): suitable for 0.06-0.14in / 1.5-3.5mm cables; 5mm / 0.2in (inner diameter): suitable for 0.14-0.2in / 3.5-5mm cables. Application: Car DVR, speaker cable, mouse cable, keyboard cable, USB cable, RS232 serial port camera cable, etc; 7mm / 0.27in (inner diameter): suitable for 0.2-0.27in / 5-7mm cables. Application: AV cable, coaxial audio, audio power cord, IP serial camera, etc; 9mm / 0.35in (inner diameter): suitable for 0.27-0.35in / 7-9mm cables. Application: HD Multimedia Interface compatible cable, VGA cable, DVI cable, power cord, speaker cable, industrial cable, etc. Package Includes: 25 Pieces Clip On Clamp Ferrite Core Rings Kit (7PCS 3.5mm/5Pcs 5mm/8Pcs 7mm/5Pcs 9mm) Note: 1. Please allow slightly error due to manual measurement. 2. Note: When the wire is too thin, you can turns at the magnetic ring to achieve Loosening effect.