NSN 4240-01-160-5618 Aviation Magnesium Survival Fire Starter Government Issue. This is the most reliable and safest fire starting tool available today. Simple, effective, safe design allows you to create fuel and light your fire in two steps. Outperforms similar fire starters from other manufacturers. Used by the U.S. Armed Forces. Magnesium shaving edge & sparking insert Water resistant instructions. Waterproof plastic. Step 1: Scrape tool with any knife (or sharp object, like a rock) to create a small pile magnesium shavings about the size if a 10c coin. Step 2: Ignite shavings with built-in sparking insert Start hundreds of fires with a flame source of 2,900°C Safe; fireproof in solid form Carry in a pocket or attach to bag with included chain loop Measures 7.62cm x 2.54cm x 0.7cm Weighs 45g It is the FIRST CHOICE for sportsmen, campers, and outdoor enthusiasts throughout the world. Count on it to work, wet or dry, even with damp kindling. It's so dependable, it's been adopted by the U.S. Armed forces for their survival kits. And all you need to make it work is a knife.