What are radio blanks usually made of?

This may be a dumb question, but I've never had one in any of my cars. Last night I found what can only be a painted plastic radio blank for my '49 Ford (it was stuck down inside the door along with some other random crap...matches, door cranks, etc). I always assumed they were metal, but I guess I was wrong? It's actually pretty cool looking!
Curt

 

The delete on my 57 was also plastic-
And it would REALLY surprise me if anyone but the factory ever made deletes-

 

K-MEMBER has a chrome one for a 51 F-1(same as 49-50 Ford car) has F O R D in big letters, and fits perfect. We have used it many cars, F-1s and shoeboxs........OLDBEET

 

The one on my 40 Standard was steel.... embossed with ridges as I recall..... it's been a few years....

 

my 54 or so pontiac delete was chromed die cast or whatever the cast metal trim parts are. got it from canada, eh?

 

The ones for the 52 chevy are metal.

B B

 

I also have one for my 49 Ford (car)
made of plastic

 

I was blown when I found my 49 ford coupe had a plastic one too.....how low-budget!

 

I have a metal 49-51 ford one with little ribbed designs

 

I've got a stack of stainless ribbed Studebaker radio deletes that I'm going to use somewhere! for something! some day!

 

51&52 F-1 ford trucks deleat plates are metal with FORD stamped on them.

 

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I have a metal 49-51 ford one with little ribbed designs

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That's what I was looking for...the ribbed design is cool, but I would want to weld and smooth it into place (so I was pretty bummed when I found out that I had one...and that it was PLASTIC!) Are you using the one that you have or would you want to sell it?
Curt