The Military Match is a 1/4" megnesium rod 2-1/2" long with a 1/8" artifical flint rod bonded along side it. I tested something of equal size in my wallet and it fit into the cavity at the fold very nicely without adding bulk. <br><br>I like the fact that it isn't just the flint, but includes the good magnesium tinder. Without the magnesium, you would have to improvise spark-catching tinder which would take precious time, especially in wet weather.<br><br>The pen would probably be far more useful on a daily basis, but the fire could be a life saver.<br><br>I agree, the flint with SAK idea is pretty good. Makes you wonder why SAK doesn't manufacture it that way. They have every other conceivable "tool" including some pretty questionable ones such as the orange peeler.<br><br>