Dreamtop Ferrite Core Ferrite Beads - 20Pcs Ferrite Choke Ferrite Clip-on Black RFI EMI Noise Suppressor with 3.5mm 5mm 7mm 9mm 13mm Inner Diameter for USB/Audio/Video Cable Power Cord

Very useful to eliminate interference in your audio and data cables good value for money

Works as expected

I was having a bit of RF or EMI interference issues while recording in my new space and thought I'd give these a shot as they are much cheaper than a power conditioner and yes they do seem to be reducing my RF/EMI interference issues and even seem to help a little with some background hiss on my audio a bit, but I'm very picky about my audio and I am listening to it through professional studio monitoring headphones, so people other than audio professionals and proper audiophiles may not notice any great difference, but they certainly seem to have worked for me. :)

I bought this set and used one of the ferrites to remove DAB radio interference being caused by a hard wired dash cam power supply.Picking the right size and choosing whether to loop the wire through is a bit hit and miss, but there a is a good variety in the set to allow you to try a few options and find one that works.Clips etc. seem good quality.

Good range of sizes in the package. However, used this on my computer's peripherals to reduce RF interference from my amateur radio, however it had no effect. There will likely be some devices or products that this will be useful for, but for amateur radio purposes, I recommend a toroid core instead (to wrap the wire or coax around multiple times).

Had microinverters that were not given a good reading. Fitted the ferrite rings to several appliances and made a big difference to the unit registering enphase inverters

Had an issue with my dash cam interfering with the radio, placed these on the wiring near the camera and it stopped the interference.

Did the job and has reduced the dabs dropping out not all the kit was required as some were too large but was as described