Coleman Camp & Hike Fire Starter Magnesium 187656 2000014858. This tool may be the size of a pocket knife but it’s large enough to produce the sparks you need to start a fire big enough for your campsite. Shave off a little magnesium with the included knife. Then use that same durable steel blade to scrape the included flint to ignite the magnesium shavings. This fire starter is fireproof and waterproof in its whole form.