What do you call a wheel that you can wear?

It can be used from the kitchen to the garage, as well as in cinematography I can be made of many metals but one metal in particular needs preperation before use, what is it?

Police jokes, huh? A pharmacy's robbed at gunpoint. Chief says to be on the lookout for a couple of hardened criminals. What was stolen?

I can go on top, Or come before, I am creamy and moist, Whether salty or not. I have many imitators, But some would agree, That unless it’s the real thing, They can’t believe it’s not me.

Born in pairs, yet never twins by fate, I kiss the ground wherever paths await. I hold no voice, yet tell where you’ve been, Through dust, through rain, through worlds unseen.