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I used a bunch if different ones before I settled on this little guy. I think they are called Sparky or something. I got tired of scratching up my knives and fumbling around with magnesium rods or blocks.
Just push down with your thumb and push it into a stack of tender. It throws a nice spark and does all the work for you. When you hands are freezing up and for some reason you don't have a lighter.... This is the way to go