The key is for size comparison only and is not included.
Stickers are cut to shape, the white square that you see is the backing paper.
All stickers are printed on premuim outdoor grade vinyl. This automotive specification vinyl is medium tack and will not damage paintwork providing it is sound, well keyed and applied to an acceptable standard. Stickers may be clear coated with most modern clear coats and lacquers (request vinyl sample when ordering for testing if you are unsure).