Spyderco decals stick anywhere but are specially designed to adhere to the back of the side mirrors on your car.

To attach:
Provide a clean and dry surface area where sticker will be placed.   Position decal face toward the surface you're applying it to with backing still attached.  Using a tool (a plastic spoon works great here) carefully apply even pressure, very lightly scrape the backside of the decal over the full adhesive area.  Peel away backing.

To remove:
Decal can be removed from surface by heating it up with a hairdryer and peeling off.