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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🔇 Silence the static, amplify your signal!

OPTIMIZE YOUR WORKSPACE - Keep your cables interference-free and your devices performing at peak efficiency.
PLUG PLAY INSTALLATION - Double snap clip design makes setup effortless—no tools, no stress.
INSTANT NOISE ELIMINATION - Effectively reduces electromagnetic interference for crystal-clear audio and data transmission.
PROFESSIONAL GRADE SHIELDING - Black ferrite core ensures durable, long-lasting EMI suppression for all your essential electronics.
UNIVERSAL FIT FOR EVERY CABLE - Five precision sizes (3mm to 13mm) to perfectly clip your cords without hassle.

This 20-piece ferrite core cable clip set from Forsun includes five sizes (3mm to 13mm) designed to reduce electromagnetic interference on various cables. Easy to install with snap clips, these black ferrite beads improve signal integrity across USB, audio, power, and network lines, ensuring faster, clearer data transmission and noise-free performance.

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