Well, I tried one out last week. I did an overnighter at a local park and decided to see how they work. Pretty darned well! The striker is built in, under the top cap. You strike it like a match. It burned very hot for at least the rated 5 minutes, perhaps more. Aside from the heat from the jet of extremely hot fire, it was so bright it was like looking at the sun! Overall I'm pretty impressed. These should ignite anything remotely flammable and also be great for signalling.