Thank you for your responses.
But the point is if the holders of such European producers like lighthouse are made of Mylar (I know what is this). On Lighthouse's webstie they write that holders are made of "Foil free of acid or chemical softeners" - see link:
The question is: Is this foil made of mylar or other kind of foil ?
I ask because I looked through few phorums and many people write, that in some holders (even made by well known manufacturers) the foil interacts with chips and coins.
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