Friend of mine is a key fobs collectioner. He wants to buy this key fob which as the seller says comes from Korea.
With the main keyfob comes some kind of black something (it's about the size of $1 ) with some red stuff inside (check the picture for reference). It's not the powder, its rather like tooth paste.
So the question is: what is it? (seller doesn't know it as well)
Maybe someone living in Korea could help ?