3 1/2" overall. Silver knurled aluminum casing with composite flint steel magnesium rod that is easy to use and provides tremendous fire starting power. O-ring sealed. Built-in super alloy striking blade can be used as a life saver if separated from knife or pack. A must have for outdoorsmen, campers, hikers, hunters, kayakers, pilots and fishermen. Weighs only 1.6 oz. Bulk packed. These fire starters are endorsed by The Navy Diver Challenge put on by the Navy Seals.