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I am often asked why larger FireSteels give larger sparks than smaller FireSteels.  Of course this observation follows simple laws of physics and chemistry. Fortunately for us, Raphael F., a loyal customer in SunnyVale California has taken the time to draw up a simple chart showing his perspective on the matter. Since a picture is worth a thousand words, here it is:FireSteel Diameter vs Metal Exposed The blue circles represent the diameter of the FireSteel rods. In this case we ca …