Could these work for a 3.5mm double coil wire?

These cores come in various sizes, that you need 3.5 mm is accommodated in a 1.5 mm cable at least up to 3.5 mm maximum, and if it does not work, you can use the core of 5 mm, which fits into a 3.5 mm cable at least up to 5 mm and I think that the cable you have should fit well in one of those two cores.

what frequencies do these absorb

that depends on the length of cable they are being used on. It's the cables that act as antennas, both radiating and receiving signals. It may take multiple units on your cables to reduce/eliminate the bothersome signals.

Will these filter out a radio station leaking into my audio

It depends on the strength and the proximity of the transmitting station. Under most conditions, you may be able to minimize or eliminate incoming radio frequency interference by clamping these onto your speaker leads. It may take more than one if the signal is very strong.

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20 Pcs Snap on Ferrite Core Cord Ring RFI EMI Noise Filter Suppressor Cable Clip for 3.5mm/5mm/7mm/9mm/13mm Diameter Cable, Black

20 Pcs Snap on Ferrite Core Cord Ring RFI EMI Noise Filter Suppressor Cable Clip for 3.5mm/5mm/7mm/9mm/13mm Diameter Cable, Black

Product ID: 348717463

⚡Easy snap-on installation

📶Reduces EMI/RFI noise interference

🔌5 cable sizes fit 3-13mm diameters

KD 8.63

Duties & taxes included

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Description

🔒 Lock in Signal Clarity, Lose the Noise!

SNAP GO CONVENIENCE - Double snap design makes installation effortless—clip on and instantly upgrade your cable performance.
SLEEK DISCREET DESIGN - Matte black finish blends seamlessly with your professional workspace or home setup.
VERSATILE APPLICATION RANGE - Ideal for USB, HDMI, audio, power, and industrial cables—keep all your devices interference-free.
UNIVERSAL FIT FOR EVERY CABLE - Includes 20 clips in 5 sizes (3mm to 13mm) to perfectly secure and filter your cables.
CRYSTAL CLEAR SIGNAL INTEGRITY - Effectively suppresses electromagnetic interference for faster, cleaner data and audio transmission.

The Forsun 20 Pcs Snap-on Ferrite Core Cable Clips set offers a comprehensive solution to electromagnetic interference across a wide range of cable diameters (3mm to 13mm). Designed for easy snap-on installation, these black ferrite cores enhance signal integrity for USB, HDMI, audio, and power cables, ensuring faster data transfer and clearer audio/video performance. Perfect for professionals seeking a clutter-free, interference-free workspace.

Specifications

ASIN	B01N0AV746
Are batteries included?	No
Best Sellers Rank	#98,347 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #36 in Ferrite Cores
Brand	Forsun
Colour	Black
Customer Reviews	4.3 4.3 out of 5 stars (619)
Date First Available	27 May 2017
Item Weight	119 g
Item model number	43237-2
Manufacturer	FORSUN
Model number	43237-2
Number of Memory Sticks	20
Package Dimensions	15.7 x 10.01 x 4.5 cm; 119.07 g

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