20/30/36/40/50Pcs Clip-on Ring Ferrite Core Bead Choke RFI EMI Filter Noise Suppressor Cable Clip for USB Audio Video Cable Power Cord 3.5mm 7mm 7mm 9mm 13mm 5 SizesFeature:1. Nickel-zinc ferrite. It can improve the electromagnetic field around the electromagnet, thus avoiding external interference;2. Easy to install, easy to use, can be disassembled, and there is a flexible clip on the port;3. Good performance, high efficiency and long service life. Placing it near an electromagnetic source can improve the quality of the audio and video signal more effectively;4. The cable clamp will not distort the transmission signal or affect the audio, video, and photo quality. Specification:Product Material: Ferrite NickelProduct Specification: Inner Diameter: 3.5mm/5mm/7mm/9mm/13mm(1) 3.5mm/0.14in(Inner Diameter): Suitable for 0.06-0.14in/1.5-3.5mm cablesApplication: Car DVR, Headphone Cable, Speaker Cable, Mouse Cable, Keyboard Cable, USB Cable, etc. (2) 5mm / 0.2in (inner diameter): suitable for 0.14-0.2in / 3.5-5mm cablesApplication: car DVR, speaker cable, mouse cable, keyboard cable, USB cable, RS232 serial port camera cable, etc. (3) 7mm / 0.27in (inner diameter): suitable for 0.2-0.27in / 5-7mm cables Application: AV cable, coaxial audio, sound power wire, IP serial camera, etc. (4) 9mm / 0.35in (inner diameter): suitable for 0.27-0.35in / 7-9mm cablesApplication: HDMI compatible cable, VGA cable, DVI cable, power cord, speaker cable, industrial wire, etc. (5) 13mm/0.51 inch (inner diameter): suitable for 0.35-0.51 inch/9-13mm cablesApplication: HDMI compatible cable, IP communication cable, DVI cable, super-fast VGA cable, etc. Product Color: BlackProduct Application:(1) clamp on signal line to play the role of anti-interference and electromagnetic compatibility(2) crimp the power cord to stabilize the current and improve sound qualityScope of application: used for all kinds of electronic jumper wires, wire harnesses, home appliances, air conditioners, computers, inverters, electric welding, power cords, etc. loosening effect.)Note: There may be slight size deviations due to manual measurement, different measuring methods and tools. The picture may not reflect the actual color of the item due to different light shooting, angle and monitor.20pcs:4X3.5mm Ferrite Rings4X5mm Ferrite Rings4X7mm Ferrite Rings4X9mm Ferrite Rings4X13mm Ferrite Rings30 Pcs:6X3.5mm Ferrite Rings6X5mm Ferrite Rings6X7mm Ferrite Rings6X9mm Ferrite Rings6X13mm Ferrite Rings36 Pieces:8X 3.5mm Ferrite Rings8X5mm Ferrite RingsFerrite Rings 6X7mm 8X9mm Ferrite Rings6X13mm Ferrite Rings40pcs:8X3.5mm Ferrite Rings8X5mm Ferrite Rings8X7mm Ferrite Rings8X9mm8X13mm Ferrite Rings50pcs:10X3.5mm Ferrite Rings10X5mm Ferrite Rings10X7mm Ferrite Rings10X9mm Ferrite Rings10X13mm Ferrite Rings