Pre-Order Item Question

I've looked practically all over. And I can't seem to find the answer I want. (If I have it's written in a way I can't understand it.)

Are you able to trade pre-order items?
Or are they customized so they can't be used by other people?

They're customized, and they can't even be shown in the trade window or dropped.

Thanks that's just what I needed to know. Shame really the Korean ones are nice.