Dome material?

Anyone know what domes are made of?
Are their different materials maybe?

My 10 mm closed domes were so comfortable I wore them all day every day and sometimes, I had to feel to see if the the aids were still there.

These new “Click Sleeves” are L so I have no idea the size. I do know they hurt my ears so, are probably too big. But, they also create a burning sensation after a few hours.

Well, I guess I got some of my answer. Medical grade silicone but there are 3 categories and two classes.

So, I guess it is that old standby answer; it depends.

Still don’t know if there is variance between type of dome and manufacturer. US vs Pakistan.