60 Pieces Clip-on Ferrite Ring Core RFI EMI Noise Suppressor Cable Clip for 3mm/ 5mm/ 7mm/ 9mm/ 13mm Diameter/Video Cable Power Cord (Black)

These ferrite cores seem to work just fine as basic HF chokes, and I feel they are a good deal at this price. I ran a test on my NanoVNA with 5 windings into the core to see which frequency range these ferrites can suppress, and they seem to do a good job between 3.5 MHz and 56 MHz. I hope this basic test on the NanoVNA helps others decide if these will help their situation.

I was having static issue on my Jeep's radio after installing some lower-cost headlights. Evidently, it's a thing. Regardless, I popped a couple of these on each of the power leads to the headlights and it has helped some. It decreased the static noise on most stations, but not all. I may need to add a couple more. Regardless, these are super easy to install once you figure out which size you need to use. They fit around cables well and with a variety of sizes on this pack, I should be able to use them in a variety of applications. They feel weighty in the hand, so I imagine they should be durable enough to withstand normal wear-and-tear. I know the real solution to my problem is to get better headlights. That's the ultimate goal/solution but for now, these ferrite rings get 5/5 Stars from me. Let me know if any questions!

Seam to work well. Used on a truck with a little noise in the radio.

They do the job eliminating and reducing rf noise in components and they snap in place easily and stay in place

I have used these on various cable sizes and they have eliminated RF problems. It's an excellent selection of sizes.

I wonder if?? Right!? Well I'm here to tell you yes these things really do work! I did my research and purchased the Tamicy brand 60 pieces assortment pack. But the bottom line is they do suppress unwanted noise and interference. I got them for my CB stuff and got them on all most everything. I'm talking- my CB -the coax the power amp and the power meter. I did that on my flat s reen tv -cable coax- wall a/c plug- plug in lites -if it has a cord it's got one on it..they are easy to use and good quality and good price.

various sizes worked well on various sized cables/wires blocking rfi need more large/medium ones less tiny ones

This review is for the Phono Stage Analog Audio enthusiast. I bought these with some skepticism but thought “what the heck”. [My System] I have an all tube analog playback system: A VPI Scoutmaster Turntable, Sumiko EVOIII Bluepoint Special High Output 2.5mV cartridge, Ming Da MC767-RD Phono Pre Amp, Pangea Audio Premier XL Phono Turntable Cable with built in ferrite rings on each end and grounding wire, Antique Sound Labs (ASL) AQ 2001 DT Pre Amp, Mogami’s top RCA interconnects throughout and a pair of ASL Hurricane DT Mono Block Power Amps with 8 KT88s in each amp. [The Problem] As you already know, eliminating phono stage ground loop and RF Interference from any system can be a frustrating task, even after attaching the perfunctory ground cable from turntable to amp/pre-amp. Before clamping these ferrite clips on I kept getting the usual annoying electrical hum, faint background FM radio station interference and the dreaded/annoying CB Radio operator chatter (and the vile unlicensed discourse that comes with it). This was the case even after having a renowned high end audio tech make extensive grounding circuitry modifications on my Ming Da. [Methodology] I clipped a ferrite ring to each end of the grounding wire (2), each end of the left RCA and right RCA cables going into the phono preamp (4) and each end of the left RCA and right RCA cables going out of the phono preamp (4) and one on each end of the RCAs out of the ASL Pre Amp to the Mono Blocks Power Amps (4) for a total of 14 ferrite rings. [Outcome] To my pleasant surprise, when I turned everything back on, all the aforementioned noises above were gone! Even when I cranked the ASL Preamp gain full tilt, the radio stations (CB and FM) were nowhere to be heard, even faintly. The electrical ground buzz was gone, too. All I heard, and only at super high ridiculous volumes (that I would never use in real life) was the noise from the phono preamp which is to be expected due to the inherent burden of MC/MM amplification. At normal listening levels my noise floor is so scarcely audible it’s basically gone, even before I drop the needle. [Conclusion] To my fellow analogue/vinyl enthusiasts fighting the ground loop/RF monster, I say buy these things. I never write reviews but this one was a must. Happy Listening!

Poco que compartir son cables de muy buena calidad - es todo.-.-.-

Have used nearly all of these they are used to reduce the effect of radio frequency interference. Have not carried out definite testing to determine if within specifications. However they have worked in all all instances where required.

used on the AC power lines to LED lights

Satisfactory for reducing domestic stray RFI...adequate light usage. Sometimes an electical tape wrapping needed to keep a loose ferrite clip tight. Thank you.