Martin:
Both, sometimes I don't get any sparks, and sometimes I get some small and weak sparks.
When I bought it I could light a piece of newspaper with it but not anymore.
I have seen shows on tv (Man vs Wild) and that guy has a flint that looks like the one I bought but that one really puts out a lot of sparks that can light a fire with natural tinder.
Thanks for any help!
Joaquin.