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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🔧 Snap, Filter, and Go! Elevate your cable game.

BULK VALUE - 20 pieces included, perfect for home, office, or professional setups.
SLEEK DESIGN - Chic black finish that seamlessly blends with your tech setup.
VERSATILE FIT - Accommodates cables from 3mm to 13mm in diameter, ensuring compatibility with a wide range of devices.
EASY INSTALLATION - Snap-on design allows for quick and hassle-free application.
SIGNAL INTEGRITY BOOST - Effectively reduces electromagnetic interference, enhancing your audio and data transmission.

The Forsun 20 Pcs Snap on Ferrite Core Cord Ring is designed to reduce RFI and EMI noise interference across various cable sizes, ensuring optimal signal integrity. With five different sizes to fit cables ranging from 3mm to 13mm in diameter, these sleek black clips are perfect for both personal and professional use.

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