Polyester string MELTING?!?!

So i saw one of andres videos and it says that polyester string will melt for certain tricks. it sounded weird to me and i was wondering what trick would do that?
heres the link


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Typically the string melts with wooden axle yoyos. That is why wooden yoyos come with cotton string. For typical 1a yoyos, you don’t have to worry about the string melting. Just change it regularly, otherwise the string may wear and snap rather than melt.


Don’t worry about it unless you’ve got a wooden axle.

I never knew that. Awesome new knowledge! ;D