What is the aluminum-colored metal tht is inside electric motors?

inside an electric motor image

Joe F

I know that it's not aluminum because it has copper wiring wrapped around it. Is it stainless steel? It is stacked in about a two inch stack that has alot in the stack and the pieces are cut really thin. Maybe .060'' thick. the electric motor came out of a ceiling fan. I am separating the brass, copper and whatever this metal is from the steel.

Answer
Silicon Steel laminations.