5pcs 42X24X16mm Toroid Core,Ferrite Rings Toroid Core Iron (Black)

Works well for RF choke

These toroids arrived promptly and were undamaged and as described. The size is good for thin coaxial cable and unterminated power lines. These did the trick to eliminate common mode current back into my transciever from a longwire on a 9:1 balun. I also have an air wound choke on the line which lowers, but does not stop common mode current, and which only reduces noice on part of the spectrum. The addition of this toroid to the feedline stopped the CMC and quieted down noise accross the spectrum.If you are looking for a toroid to use on 110ac wires with standard or grounded plugs you will need a larger size, these would be perfect for DC lines from your power supply.I am unsure of the mix, but will attemp to build a few baluns/ununs in the future and see how they perform. This is a great price and they are good toroids.

Product is as advertised - nice size allowed for easy cable threading. Final solution to a unique problem was to slow a Fluke 8842a’s sample rate down to “S0” to turn on internal analog and digital filters.

Did what they are supposed to do.

There was a lot of excess electrical noise on my Starlink conversion to 12v. These rings helped calm things down a lot. Now it performs much better.

This was installed in the electrical panel by an electrician to eliminate the buzzing of appliances and flickering lights when the instant hot water heater comes on.

There is no specification on these toroids. Through an experiment I would guess them to be somewhere around type 61 material. I was hoping for type 43. Oh well. You get what you pay for.

Perfect