Magnesium rod with built in ferrro rod 
 
Useful size to keep on a key ring or attach to your pack. Just add your own tinder and striker.
Comes with steel key ring to fix to your bag.
 
Just scrape off a small amount of magnesium to make an effective excelerant,  drop a spark or two on it from the attached ferrocerium rod and the tinder of your choice for instant fire.