Are silk dome tweeters actually silk?


Is the material they are made of genuine silk or is that just the type of 'weave' they do ? For example with YG Acoustics.
smodtactical
I talked to YG Acoustics and they said their billet dome tweeter is silk with a metal frame, but when pressing them they state its not real silk its synthetic polyester.
If it was not made of silk it would be called a soft dome tweeter. Yes it is silk!