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They’re Lighter Flints!
Also known as Ferrocerium, Lighter Flints are basicallyย a man-made metallic material that produces hot sparks at temperatures of about 3,000ย ยฐC (5,430ย ยฐF) when scraped against a rough surface, such as ridged steel. Because of this property it is used in many applications, such as clockwork toys, strikers for gas welding and cutting torches, so-called “flint-and-steel” or “flint spark lighter” fire-starters in emergency survival kits and cigarette lighters, as the initial ignition source for the primary fuel.ย It is also commonly called a ferro rod and most commonly of all, flint (particularly in cigarette lighters)
Credit: wikipedia.com