I've found one type of starter that works quite well, though it is considerably larger than the one posted. It's called the "StrikeForce" by Gerber USA. It is 5x1.25x1 inch. Not exactly a keychain model but small enough for backpack use. The element is about a half inch in diameter contained in a PVC case that has the striker in the cap and a hollow handle for tinder storage. throws a mean,hot spark shower that gives a positive ignition to the right tinder. My choice is shredded cedar bark that has been sundried. I've had this model for years and am not sure of current availability.