Car radiator fan motor

Hi got a car radiator fan motor flex a lite interesting my first radiator motor not what I was expecting inside it had a big magnet like a microwave and beneath the magnet was a strange metal looked kinda like a saw blade about the wighth of a saw blade to. It is 2oz according to my scale non magnetic it's shiny like brass but wouldn't it be heavier than 2oz ?.

No its flat like a saw blade the motor casing then the flat thing then a magnet sat on top of it then another steel casing if I was able to figure out how to get more pictures on here I would have posted a picture haha.