The meaning behind those colorful balls on power lines

Red Balls on Power Lines: Why Are They Up There?

Orange coloured Plastic balls, so called flight warning balls, are installed at the power lines of RWE in Moers, Germany, 18 April 2011. RWE renewed 18 old power-pylons in North Rhine-Westphalia. Photo

What Are Those Colorful Aerial Marker Balls On Power Lines?

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The meaning behind those colorful balls on power lines

Why are colored balls used in Power Transmission Lines?

What Are Those Colorful Balls That Are Attached To Power Lines? » Science ABC

Skin Effect and Factors Affecting Skin Effect in Power Lines

What Are Those Balls That Hang on Power Lines?