Ever heard of Aluminum Ring Tea Bags?

 

I was lurking on the Library of Congress website recently when I came across this advertisement that appeared in the October 1925 issue of The Tea and Coffee Trade Journal. I wish it were a bit sharper, but still, I think you can read it well enough to tell that it's promoting "Aluminum Ring Tea Bags." What on earth?

Part of the ad reads, "One trial for Aluminum Ring Tea Bags will prove to you what we have proved to thousands who are now our most faithful customers. Aluminum Ring Tea Bags are the most popular and the most extensively used tea bags in the world. And they don't cost any more than ordinary tea bags."

Looking at the photo, I'm guessing that the aluminum ring is sort of like a twist-tie of yesteryear, maybe. Any of you ever heard of these before? This was news to me!