These are the DOAN MFG. Magnesium Firestarters. Suppliers to the Military for the most trusted Fire starters in North America.
Waterproof. Magnesium metal with included flint. Perfect for igniting your tinder, attaches to your bag or keychain.
It's a rock attached to a piece of metal, If you could break it in half it would still work, and if you smashed it into a thousand pieces it would work even better. Best tool for starting fires in the Cold, wet or both.