The fire starter is not only a cool party trick, it might get you out of trouble when everything else is wet. It does not run out of gass, and works every time.
Use the unsharp edge of your knife to make the "steel" spark. The magnesium burns at about 3000 C, and will ignite fine "tinder" that is ised as the base of the fire.
This one has a shaft made of reindeer horn.