What is the back of the iPhone made of?

[tblmn]

I searched the forums for this and did not see anything about it. Is the back of the iPhone brushed metal? Is it plastic?

thanks!

 

[Furgster]

i think the silver part is aluminum and the black part is plastic

 

[kevinwiz]

ipod nano material and the black part is i'm not sure what.

 

[Fuzzy Orange]

So it is Anodized Aluminum and black plastic?

 

[Rojo]

I wonder if they'll ever have engraving for iPhones like they do with iPods...