Intercooler Composition?

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What is the intercooler made of?

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'95, 2500, 4X4, ext cab, white, 3. 54 rear end, auto transmission
Griffin Radiator, Banks Power Pak, Kondolay TC, Kondolay VB, 16cm Turbo, 4" exhaust, Horton Fan, Bosch 215, BD Governor Springs, Brite Box, Mag Hytec transmission Pan, aux transmission Cooler, Bully Dog Propane, Gutless Kitty, Wiley Coyote strapped to my grill

 

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aluminum

 

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Thanx