White plastic "tube" standing rigging protection?

Slavko Despotovic

I have number or almost all standing rigging parts from deck level to up to 2m above covered with white plastic tubes. I have asked a rigger what is this for and his response was that it does not make sense. I never so it on other boats. But with Amel one never knows. I have attached a photo where one can see what I am talking about. Any help highly appreciated.

SM 2000
#279 Bonne Anse in Portoroz

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