I think what 1989therat means is a window sticker as opposed to a bumper sticker:
The Goodwood stickers aren't really stickers in the normal sense - they peel on and off adn are reusable more than once (for example, those 2 used to be in my previous Mini, and I half-peeled one of the Goodwood stickers off to show what I mean). The Italian Job sticker - same sort of thing as the GTP bumper sticker, I think - is a permanent, non-transferable, proper sticker in that it has one sticky, glued side and can't be removed. I don't know what the Goodwood stickers are made of, but it isn't the same as a normal bumper sticker.