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.

20 Pcs Snap On Ferrite Core Cord Ring Rfi Emi

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Sold byAmazon Cote D' IvoireDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔒 Lock in Signal Purity, Lose the Noise!

SNAP GO CONVENIENCE - Tool-free double snap design makes installation a breeze—clip on and enjoy instant noise reduction.
VERSATILE APPLICATION RANGE - Ideal for USB, HDMI, power cords, AV cables, and more—future-proof your tech setup effortlessly.
PROFESSIONAL GRADE DURABILITY - Robust black ferrite cores built to last, ensuring consistent performance in demanding environments.
UNIVERSAL FIT FOR EVERY CABLE - Five precision sizes (3, 5, 7, 9, 13mm) to perfectly secure and filter your cables.
CRYSTAL CLEAR SIGNAL INTEGRITY - Effectively suppresses electromagnetic interference for flawless audio, video, and data transmission.

This 20-piece set of snap-on ferrite core cable clips includes five sizes to fit cables from 3mm to 13mm diameter. Designed to reduce electromagnetic interference (EMI) and radio frequency interference (RFI), these black ferrite rings improve signal clarity across a wide range of cables including USB, HDMI, audio, and power cords. Easy to install with a double snap mechanism, they provide a professional-grade solution to noise suppression for your home or office tech setup.

Specifications

ASIN	B01N0AV746
Best Sellers Rank	#92,332 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #19 in Electromagnetic Interference Filters
Date First Available	November 9, 2016
Is Discontinued By Manufacturer	No
Item Weight	4.2 ounces
Item model number	43237-2
Manufacturer	FORSUN
Package Dimensions	6.18 x 3.94 x 1.77 inches

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