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It might be something called a "pendulum detuner". The are designed to partially damp out the worst natural mechanical resonance frequency of the cable. Wind can excite resonance in a cable, which causes much higher stresses than just the normal hanging due to gravity.
I found an informative web page from the PLP Company about these products. That page also has a video explaining the problem and how pendulum detuners address it. Here is an excerpt from that page with the basic info:
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